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Richard D. Guyer, M.D.

Orthopedic Spine Surgeon Texas Back InstituteOrthopedic Spine Surgery
6020 W. Parker Road Suite 200 Plano, TX 75093 Phone: 972-608-5000

Biography

| Practicing Locations: Plano
| Personal Quote:
“My treatment philosophy is to treat my patients the way I would want myself or my family members to be treated. I always utilize what I like to refer to as the ‘family test’ when advising treatment and surgical options for my patients.”
| Specialty: Spine Surgery
| Fellowship Training: Spine Surgery
| Certification: Certified- American Board of Orthopedic Surgery

| Richard Guyer, M.D.

Richard Guyer, M.D. is the Co-founder of the Texas Back Institute and Director of their Spine Fellowship Program. Dr. Guyer is also co-director for the Center for Disc Replacement at Texas Back Institute. Dr. Guyer earned his medical degree from the University of Pennsylvania School of Medicine. He completed his internship at Parkland Memorial Hospital in Dallas, TX and continued with his residency program in Orthopedic Surgery at the Hospital of the University of Pennsylvania. Dr. Guyer then completed two spine fellowships in Ohio and California.

Dr. Guyer holds many honors including founder of the Texas Back Institute Research Foundation and Chairman of the Board for the program. Dr. Guyer has received the Best Doctor Award from D Magazine for multiple years, is past president of the North American Spine Society and winner of the Volvo Award for Low Back Pain Research.

| Education

  • 1982 Spine Fellowship with Leon Wiltse, M.D.,Long Beach
  • California 1981 Spine Fellowship
  • Case Western Reserve University with Henry Bohlman, M.D., Cleveland
  • Ohio 1976-1980 Orthopedic Surgery Residency, Hospital of the University of Pennsylvania, Philadelphia
  • Pennsylvania 1975-1976 Internship, Parkland Memorial Hospital
  • Southwestern School of Medicine, Dallas, Texas 1975 M.D.
  • University of Pennsylvania School of Medicine, Philadelphia
  • Pennsylvania 1971 B.S., Ursinus College
  • Collegeville, Pennsylvania

| Awards/Recognition

  • Director, Texas Back Institute Spine Fellowship ProgramFounder and Chairman of the Board, Texas Back Institute Research Foundation Associate Clinical Professor
  • Department of Orthopedics, University of Texas Southwestern Medical School
    Dallas, TexasEditorial Board Member, SpineEditorial Board Member, The Spine JournalEditorial Advisor,
    University of Pennsylvania Orthopedic Journal
    Editorial Board Member,
    Journal of American Academy of Orthopedic Surgery Best Doctor Award
    D Magazine, Dallas
  • TexasPresident, North American Spine SocietyUrsinus College Alumni AwardDavid Selby Award
  • North American Spine SocietyVolvo Award
  • Low Back Pain ResearchAssistant Professor of Orthopedic Surgery
  • University of Texas Health Science Center, Houston
  • TexasGraduated Cum Laude from Ursinus College

| Publications, Books & Presentations

As world-renowned leaders in the field of neck and back care, Texas Back Institute doctors are continuously writing and presenting professional articles, publications and speaking engagements to national and international audiences.
PUBLICATIONS

1. Guyer RD, Booth RE, Rothman RH: Pulmonary Embolism Prophylaxis in Total Hip Patients: A study comparing low dose Coumadin and aspirin. J Bone Joint Surg 64A:1040-1044, 1982.

2. Guyer RD: Total Joint Replacement: An Update. Am Fam Phys XX:196-201, 1982.

3. Heard CS, Guyer RD, Smith TK: Intramedullary Rodding of the Femur: An Update. Med J St. Joseph’s Hospital 17(1):29-37, 1982.

4. Wiltse LL, Spencer CW, Guyer RD, Glenn WV, Porter IS: Alar-Transverse Process Impingement of the L5 Spinal Nerve: The Far-Out Syndrome. Spine 9:31-41, 1984.

5. Barber FA, Guyer RD, Burton WC: The Heparin-Induced Thrombocytopenia and Thrombosis Syndrome. J Bone Joint Surg 69A (6):935-937, 1987.

6. Sachs BL, Vanharanta H, Spivey MA, Guyer RD, Videman T, Rashbaum RF, Johnson RG, Hochschuler SH, Mooney V: Dallas Discogram Description: A New Classification of CT/Discography in Low-Back Disorders. Spine 12:287-294, 1987.

7. Vanharanta H, Sachs BL, Spivey MA, Guyer RD, Hochschuler SH, Rashbaum RF, Johnson RG, Ohnmeiss DD, Mooney V: The Relationship of Pain Provocation to Lumbar Disc Deterioration as Seen by CT/Discography. Spine 12:295-298, 1987.

8. Vanharanta H, Sachs BL, Spivey MA, Hochschuler SH, Guyer RD, Rashbaum RF, Ohnmeiss DD, Mooney V: A Comparison of CT/Discography, Pain Provocation and Radiographic Disc Height. Spine 13:321-324, 1988.

9. Loguidice VA, Guyer RD, Stith WJ, Ohnmeiss DD, Hochschuler SH, Rashbaum RF: Anterior Lumbar Interbody Fusion. Spine 13:366-369, 1988.

10. Hochschuler SH, Guyer RD, Stith WJ, Ohnmeiss DD, Rashbaum RF, Johnson, RG: Proplast Reconstruction of Iliac Crest Defects. Spine 13:378-379, 1988.

11. Guyer RD, Collier RR, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Vanharanta H, Loguidice VA: Extraosseous Spinal Lesions Mimicking Disc Disease. Spine 13:328-331, 1988.

12. Guyer RD, Collier R, Stith WJ, Ohnmeiss DD, Hochschuler SH, Rashbaum RF, Regan JJ: Discitis After Discography. Spine 13:1352-1354, 1988.
13. Vanharanta H, Guyer RD, Ohnmeiss DD, Stith WJ, Sachs BL, Aprill C, Spivey M, Rashbaum RF, Hochschuler SH, Videman T, Selby DK, Terry A, Mooney V: Disc Deterioration in Low-Back Syndromes: A Prospective, Multi-Center CT/Discography Study. Spine 13:1349-1351, 1988.

14. Vanharanta H, Sachs BL, Ohnmeiss DD, Spivey M, Guyer RD, Rashbaum RF, Hochschuler SH, Stith WJ, Mooney V: Pain Provocation and Disc Deterioration by Age: A CT/Discography Study in Low Back Pain Population. Spine 14:420-423, 1989.

15. Sachs BL, Spivey MA, Vanharanta H, Guyer RD, Rashbaum RF, Hochschuler SH, Smith GV, Scala AD: Techniques for Lumbar Discography and CT/Discography in Clinical Practice. J Applied Radiology Nov, 1989.

16. Sachs BL, Spivey MA, Vanharanta H, Guyer RD, Rashbaum RF, Hochschuler SH, Scala AD: Techniques for lumbar discography and computed tomography-discography in clinical practice. Orthop Rev 19(9):775-778, 1990.

17. Stith WJ, Judy MM, Hochschuler SH, Guyer RD: Choice of Lasers for Minimally Invasive Spinal Surgery. Orthop Rev 22(2):137-142, 1991.

18. Sasso RC, Cotler HB, Guyer RD: Diagnostic Imaging Studies for Low Back Pain. J Musculoskeletal Medicine 8(5):21-37, 1991.

19. Guyer RD, Ohnmeiss DD: Lumbar Discography and CT/Discography. The University of Pennsylvania Orthopaedic J 7:61-63, 1991.

20. Shea DD, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Rashbaum RF: The Effect of Sensory Deprivation on the Reduction of Pain in Chronic Low Back Patients. Spine 16(5):560-561, 1991.

21. Guyer RD: Selective Discography, CT/Discography, and Pain Provocation Testing. Seminars in Orthopaedics 6(2):90-91, 1991.

22. Guyer RD, Hochschuler SH, Spivey MA, Ohnmeiss DD, Castleman C: Case Report: The Use of Dynamic MRI to Identify Cervical Spine Disc Herniation and Cord Compression. Spine 17(5):596-597, 1992.

23. Vanharanta H, Floyd T, Ohnmeiss DD, Guyer RD, Hochschuler SH: The Relationship Between Facet Tropism and Degenerative Disc Disease. Spine 18(8):1000-1005, 1993.

24. Guyer RD, Ohnmeiss DD: The Role of Discography and Interdiscal Therapy. Current Opinion in Orthopaedics. 5(II):49-53, 1994.

25. Guyer RD, Hochschuler SH: Minimally Invasive Surgical Techniques for the Treatment of the Herniated Lumbar Disc. Seminars Spine Surg 6(4):256-261, 1994.

26. Ohnmeiss DD, Guyer RD, Hochschuler SH: Laser Disc Decompression: The Importance of Proper Patient Selection. Spine 19(18):2054-2059, 1994.

27. Moneta GB, Videman T, Kaivanto K, Aprill C, Spivey M, Vanharanta H, Sachs B, Guyer RD, Hochschuler S, Rashbaum R: Reported pain during lumbar discography as a function of anular disruption and disc degeneration. Spine 19:1968-1974, 1994.

28. Weinhoffer SL, Guyer RD, Herbert M, Griffith SL: In-Vitro Intradiscal Pressure Measurements Above a Simulated Instrumented Fusion. Spine 20(5):526-531, 1995.

29. Ohnmeiss DD, Vanharanta H, Guyer RD: The Association Between Pain Drawings and CT/Discographic Pain Responses. Spine 20(6):729-733, 1995.

30. Bogdanffy GM, Ohnmeiss DD, Guyer RD: Early Changes in Bone Mineral Density above a Combined Anterior-Posterior L4-S1 Lumbar Spinal Fusion: A Clinical Investigation. Spine 20(15):1674-1678, 1995.

31. Guyer RD, Ohnmeiss DD: Contemporary Concepts in Spine Care: Lumbar discography. Position Statement from the North American Spine Society Diagnostic and Therapeutic Committee. Spine 20(18):2048-2059, 1995.

32. Herzog RJ, Guyer RD, Graham-Smith A, Simmons ED Jr. Magnetic resonance imaging. Use in patients with low back or radicular pain. Position Statement from the North American Spine Society. Spine 20(16):1834-1838, 1995.

33. Griffith SL, Weinhoffer SL, Shelokov AP, Guyer RD, Contiliano J, Geiger J: Biomechanical Comparison of Anterior Instrumentation for the Cervical Spine. J Spinal Disord 8(6):429-438, 1995.

34. Simmons ED Jr, Guyer RD, Graham-Smith A, Herzog R. Radiographic assessment for patients with low back pain. Position Statement from the North American Spine Society. Spine 20(16):1839-1841, 1995.

35. Block AR, Vanharanta H, Ohnmeiss DD, Guyer RD: Discographic Pain Reports: Influence of Psychological Factors. Spine 21(3):334-338, 1996.

36. Gronblad M, Virri J, Ronkko S, Kiviranta I, Vanharanta H, Seitsalo S, Rashbaum R, Guyer R: 1996 Volvo Award; A Controlled Biochemical and Immunohistochemical Study of Human Synovial Type (Group 11) Phosholipase A2 and Inflammatory Cells in Macroscopically Normal, Degenerated and Herniated Human Lumbar Disc Tissue. Spine 21(22):2531-2538, 1996.

37. Regan JJ, McAfee PC, Guyer RD, Aronoff RJ: Laparoscopic fusion of the lumbar spine in a multicenter series of the first 34 consecutive patients. Surg Laparosc Endosc 6(6):459-68, 1996.

38. Guyer RD, Ohnmeiss DD: [letter] Response to Fraser’s comments on Lumbar Discography Position Statement. Spine 21(10):1275-1276, 1996.

39. Guyer RD, Ohnmeiss DD, Mason SL, Shelokov AP: Complications of Cervical Discography: Findings in a Large Series. J Spinal Disord 10(2):95-101, 1997
40. Jarolem K, Tucker WA, Fulp T, Guyer RD: Rigid Intrasegmental Fixation for Repair of a Symptomatic Pars Defect in a Young Athlete: A Case Report and Description of Technique. J Spin Disord 10(3):253-255, 1997.

41. Regan JJ, Guyer RD: Endoscopic Techniques in Spinal Surgery. Clin Orthop (335):122-39, 1997.

42. Goodwin CB, Brighton CT, Guyer RD, Johnson JR, Light KI, Yuan HA: A Double-Blind Study of Capacitively Coupled Electrical Stimulation as an Adjunct to Lumbar Spinal Fusion. Spine 24(13):1349-1357, 1999.

43. Ohnmeiss DD, Guyer RD, Mason SL: Relationship of Cervical Discographic Pain Responses to Radiographic Images. Clin J Pain 16(1):1-5, 2000.

44. Ohnmeiss DD, Guyer RD: Provocative Discography for Diagnostic Purposes in Patients With Discogenic Pain – Its Therapeutic Implications. Current Anesthesiology Reports 2(3):175-180, 2000.

45. Block AR, Ohnmeiss DD, Guyer RD, Rashbaum RF, Hochschuler SH: The Use of Presurgical Psychological Screening to Predict the Outcome of Spine Surgery. Spine J 1(4):274-282, 2001

46. Guyer RD, Burton DC: Differential Diagnosis of Spinal Disorders. In Fardon et al (eds): Orthopaedic Knowledge Update: Spine. American Academy of Orthopaedic Surgeons; Rosemont, Illinois, 2002 pp. 87-96.

47. Hochschuler SH, Ohnmeiss DD, Guyer RD, Blumenthal SL: Artificial Disc: Preliminary Results of a Prospective Study in the United States. European Spine J 11(Suppl 2):S106-110, 2002.

48. Blumenthal SL, Ohnmeiss DD, Guyer R, Hochschuler S, McAfee P, Garcia R, Salib R, Yuan H, Lee C, Bertagnoli R, Bryan V: Artificial Discs and Beyond: A North American Spine Society Annual Meeting Symposium. Spine J 2(6):460-463, 2003.

49. Gronblad M, Habtemariam A, Virri J, Seitsalo S, Vanharanta H, Guyer RD: Complement Membrane Attack Complexes in Pathologic Disc Tissues. Spine 28(2):114-118, 2003.

50. Guyer RD, Ohnmeiss DD: Intervertebral Disc Prostheses. Spine 28(15S):S15-S23, 2003.

51. Chang Y, Guyer RD, Ohnmeiss DD, Moore S: Case Report: Intra-operative Left Common Iliac Occlusion in a Scheduled 360 Degree Spinal Fusion. Spine 28(16):E316-E319, 2003.

52. Guyer RD, Ohnmeiss DD: Contemporary Concepts Reviews: Lumbar Discography. Spine J 3(3S):11S-17S, 2003.

53. Herzog RJ, Ghanayem AJ, Guyer RD, Graham-Smith A, Simmons ED: Contemporary Concepts Reviews: Radiographic Assessment for Patients with Low Back Pain. Spine J 3(3S):6S-10S, 2003.

Simmons ED, Guyer RD, Graham-Smith A, Herzog R: Contemporary Concepts Reviews: Magnetic Resonance Imaging: Use in Patients with Low Back Pain or Radicular Pain. Spine J 3(3S):3S-5S, 2003.

54. Blumenthal SL, Ohnmeiss DD, Guyer RD, Hochschuler SH: Prospective Study Evaluating Total Disc Replacement: Preliminary Results. J Spinal Disord Tech 16(5):450-454, 2003.

55. Geisler FH, Blumenthal SL, Guyer RD, McAfee PC, Regan JJ, Johnson JP, Mullin B: Neurological Complications of Lumbar Artificial Disc Replacement and Comparison of Clinical Results with those Related to Lumbar Arthrodesis in the Literature: Results of a Multicenter, Prospective, Randomized Investigational Device Exemption Study of Charite Intervertebral Disc. J Neurosurg Spine 1(2):143-154, 2004.

56. Guyer RD, McAfee PC, Hochschuler SH, Blumenthal SL, Fedder IL, Ohnmeiss DD, Cunningham BW: Prospective Randomized Study of the Charité Artificial Disc: Data from Two Investigational Centers. Spine J 4(6 Suppl):252S-259S, 2004.

57. Blumenthal SL, McAfee PC, Guyer RD, Hochschuler SH, Geisler FH, Holt RT, Garcia R Jr, Regan JJ, Ohnmeiss DD: A Prospective, Randomized, Multi-Center FDA IDE Study of Lumbar Total Disc Replacement with the CHARITÉ™ Artificial Disc vs. Lumbar Fusion: Part I – Evaluation of Clinical Outcomes. Spine 30(14):1565-1575, 2005.

58. McAfee PC, Cunningham B, Holtsapple G, Bussard-Adams K, Blumenthal S, Guyer RD, Dmietriev A, Maxwell J, Regan J, Isaza J: A Prospective, Randomized, Multi-Center FDA IDE Study of the Charité™ Artificial Disc: A Radiographic Outcomes Analysis, Correlation of Surgical Technique Accuracy with Clinical Outcomes, and Evaluation of the Learning Curve. Spine 30(14):1576-1583, 2005.

59. McAfee PC, Guyer RD: History and Design Rationale for the CHARITE Artificial Disc. Lumbar Spine Arthroplasty: Volume I. Quality Medical Publishing. St. Louis, MO, 2005;

pp. 13-28.

60. Blumenthal SL, Guyer RD: Indications, Contraindications, and Radiographic Evaluation. Lumbar Spine Arthroplasty: Volume II. Quality Medical Publishing. St. Louis, MO, 2005;

pp. 3-16.

61. Blumenthal SL, Guyer RD: IDE Clinical Studies: Results of a Prospective, Randomized, Multicenter, FDA-Controlled Clinical Trial. Lumbar Spine Arthroplasty: Volume II. Quality Medical Publishing. St. Louis, MO, 2005; pp. 17-38.

62. Blumenthal SL, Guyer RD, Cappuccino A: Discectomy. Lumbar Spine Arthroplasty: Volume III. Quality Medical Publishing. St. Louis, MO, 2005; pp. 17-39.

63. Tolonen J, Gronblad M, Vanharanta H, Virri J, Guyer RD, Rytomaa T, Karaharju EO: Growth Factor Expression in Degenerated Intervertebral Disc Tissue an Immunohistochemical Analysis of Transforming Growth Factor Beta, Fibroblast Growth Factor and Platelet-Derived Growth Factor. Eur Spine J 15(5):588-96, 2006.

64. Small S, Guyer RD, Ohnmeiss DD: Faces of Spine Care: From the Procedure Room: When Spinal Injection Becomes Advanced Imaging. Spine J 6(1):96-97, 2006.
66. Guyer RD, Elders G: Disc Prosthesis for Lumbar Degenerative Disease and Axial Instability –CHARITE Artificial Disc. Seminars in Spine Surgery 17(4):297-309, 2005.

67. Dickerman RD, Guyer RD: [Letter to the Editor] Intraoperative Electromyography for Lateral Mass and Pedicle Screws: Technique is the Key! J Spinal Disord Tech19(6):463, 2006.

68. McAfee PC, Geisler FH, Saiedy SS, Moore SV, Regan JJ, Guyer RD, Blumenthal SL, Fedder IL, Tortolani PJ, Cunningham B: Revisibility of the CHARITÉ Artificial Disc Replacement: Analysis of 688 Patients Enrolled in the U.S. IDE Study of the CHARITÉ Artificial Disc. Spine 31(11):1217-1226, 2006.

69. Dickerman RD, Guyer RD, Hisey MS: [Letter to the Editor commenting on article: Automated Intraoperative EMG Testing during Percutaneous Pedicle Screw Placement.] Spine J 6(4):473, 2006.

70. Regan JJ, McAfee PC, Blumenthal SL, Guyer RD, Geisler FH, Garcia R, Maxwell, JH. Evaluation of Surgical Volume and the Early Experience with Lumbar Total Disc Replacement as Part of the Investigational Device Exemption Study of the Charité Artificial Disc. Spine 31(19):2270-2276, 2006.

71. Guyer RD, Patterson M, Ohnmeiss DD: Failed Back Surgery Syndrome: Diagnostic Evaluation.J Am Acad Orthop Surg 14(9):534-43, 2006.

72. Guyer RD, Tromanhauser SG, Regan JJ: An Economic Model of One-Level Lumbar Arthroplasty vs. Fusion. Spine J 7(5):558-562, 2007.

73. Blumenthal SL, Guyer RD, Geisler FH, McAfee PC, Regan JJ: The First 18 Months Following FDA Approval of Lumbar Total Disc Replacement in the United States: Reported Adverse Events Outside an IDE Study Environment. SAS J 1(1):8-11, 2007.

74. Holt R, Majd M, Isaza J, Blumenthal S, McAfee P, Guyer R, Hochschuler S, Geisler F, Garcia R, Regan J: Complications of Lumbar Artificial Disc Replacement vs. Fusion: Results from the Randomized, Multicenter FDA IDE Study of the CHARITÉ Artificial Disc. SAS J 1(1):20-27, 2007.

75. Guyer RD, Tromanhauser SG, Regan JJ: An Economic Model of One-Level Lumbar Arthroplasty vs. Fusion. Spine J 7(5):558-62, 2007.

76. Guyer RD: North American Spine Society Presidential Address: The Paradox in Medicine Today – Exciting Technology and Economic Challenges. Spine J 8(2):279-285, 2008.

77. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ. Patient selection for lumbar arthroplasty and arthrodesis: the effect of revision surgery in a controlled, multicenter, randomized study. J Neurosurg Spine 8(1):13-6, 2008.

78. Cunningham BW, McAfee PC, Geisler FH, Holsapple G, Adams K, Blumenthal SL, Guyer RD, Cappuccino A, Regan JJ, Fedder IL, Tortolani PJ. Distribution of in vivo and in vitro range of motion following 1-level arthroplasty with the CHARITE artificial disc compared with fusion. J Neurosurg Spine 8(1):7-12, 2008.
79. Guyer RD, Geisler FH, Blumenthal SL, McAfee PC, Mullin BB: Effect of Age on Clinical and Radiographic Outcomes and Adverse Events Following 1-level Lumbar Arthroplasty after a Minimum 2-year Follow-up. J Neurosurg Spine 8(2):101-107, 2008.

80. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ: Effect of Previous Surgery on Clinical Outcome Following 1-level Lumbar Arthroplasty. J Neurosurg Spine 8(2):108-114, 2008.

81. Guyer RD, Siddiqui S, Zigler JE, Ohnmeiss DD, Blumenthal SL, Sachs BL, Hochschuler SH, Rashbaum RF: Lumbar Spinal Arthroplasty: Analysis of One Center’s 20 Best and 20 Worst Clinical Outcomes. Spine 33(23):2566-2592, 008.

82. Rohan MX Jr, Ohnmeiss DD, Guyer RD, Zigler JE, Blumenthal SL, Hochschuler SH, Sachs BL, Rashbaum RF: Relationship between the Length of Time Off Work Pre-operatively and Clinical Outcome at 24-month Follow-up in Patients Undergoing Total Disc Replacement or Fusion. Accepted for publication in Spine J.

83. Guyer RD, McAfee PC, Banco RJ, Bitan FD, Cappuccino A, Geisler FH, Hochschuler SH, Holt RT, Jenis Lg, Majd M, Regan JJ, Tromanhauser SG, Wong DC, Blumenthal SL: Prospective, Randomized, Multicenter Food and Drug Administration Investigational Device Exemption Study of Lumbar Total Disc Replacement with the CHARITE Artificial Disc Versus Lumbar Fusion: Five-Year Follow-up. Accepted for publication in Spine J.

84. Shellock J, Guyer RD: Total Disc Replacement at the Texas Back Institute: Our Journey Over the Past 18 Years. Coluna, in press.

BOOKS AND BOOK CHAPTERS

1. Guyer RD (Editor): SPINE – State of the Art Review: Lumbar Disc Disease. Hanley & Belfus; Philadelphia, January, 1989.

2. Flemming J, Guyer RD: Diagnostic Dilemmas. In: Guyer RD (ed) SPINE – State of the Art Review: Lumbar Disc Disease. Hanley & Belfus; Philadelphia, January 1989; pp 153-172.

3. Guyer RD, Flemming J: Laminectomy-Indications, Techniques and Complications. In: Guyer RD (ed) SPINE – State of the Art Review: Lumbar Disc Disease. Hanley & Belfus; Philadelphia, January 1989; pp 91-102.

4. Guyer RD: Lumbar CT/Discography. In: P Kambin (ed) Percutaneous Approach to the Lumbar Spine. Urban & Schwarzenberg Medical Publishers, Inc. 1990.

5. Guyer RD: Lumbar CT/discography. In: P Kambin (ed) Arthroscopic Microdiscectomy: Minimal Intervention in Spine Surgery. Baltimore; Urban & Schwarzenberg; 1991, pp 49-56.

6. Matwijecky C, Guyer RD: Cervical Discectomy and Fusion. In: Regan JJ (ed) SPINE-State of the Art Review: Cervical Spine Disease. Hanley & Belfus, Inc., Philadelphia, 1991; pp 259-271.

7. Hochschuler, RD Guyer, HB Cotler (Editors): Rehabilitation of the Spine: Science and Practice. Mosby Year Book, Chicago, 1993.

8. Guyer RD: Laboratory Testing. In: Hochschuler SH, Guyer RD, Cotler HB (eds) Rehabilitation of the Spine: Science and Practice. Mosby Year Book, Chicago, 1993. pp 113-118.

9. Hochschuler SH, Guyer RD: Arthroscopic Microdiscectomy. In: Hochschuler SH, Guyer RD, Cotler HB (eds) Rehabilitation of the Spine: Science and Practice. Mosby Year Book, Chicago, 1993. pp 601-608.

10. Guyer RD, Kambin P: Arthroscopic Microdiscectomy: Posterolateral Approach. In: Regan JJ, McAfee PC, Mack MJ (eds) Atlas of Endoscopic Spine Surgery. Quality Medical Publishing. St. Louis, MO. 1995. pp 257-274.

11. Guyer RD, Ohnmeiss DD: Invasive Radiology and Pain Location. In: Margulies J (ed) SPINE: State of the Art Review: Adult L5-S1 Surgery. Hanley & Belfus, Philadelphia; 1997; pp 59-67.

12. Guyer RD, Delamarter RB, Fulp T, Small SD: Complications of Cervical Spine Surgery. In: H Herkowitz et al. (eds) The Spine. WB Saunders Company; Philadelphia, Pennsylvania 1999; pp 540-557.

13. Guyer R, Fulp T: Minilaparotomy: Perirectus Retroperitoneal Approach for Anterior Lumbar Interbody Fusion. In: Zdeblick TA (ed) Anterior Approaches in Spine Surgery. Quality Medical Publishing, Inc., St. Louis, Missouri 1999; pp 203-207.

14. Guyer RD, Ohnmeiss DD: Pain Evaluation, Invasive Radiology, and Patient Selection in Previously Operated Patients. In: Margulies J (ed) Revision Spine Surgery. Mosby; St. Louis, Missouri. 1999: pp 201-210.

15. Guyer RD, Blumenthal SL: Preliminary Unites States Experience with the SB Charité III Artificial Discs. In: Büttner-Janz K, Hochschuler SH, McAfee PC (eds): The Artificial Disc. Springer-Verlag, Berlin, Germany, 2003, pp. 139-145.

16. Block AR, Gatchel RJ, Deardorff WW, Guyer RD (Authors): The Psychology of Spine Surgery. Block AR (ed) American Psychological Association, Washington, D.C., 2003.

17. Guyer RD, Ohnmeiss DD: Degenerative Disc Disease: Fusion Cages and Dowels. In: Herkowitz H, Dvorak J, Bell G, et al (eds): The Lumbar Spine, 3rd Edition. Lippincott Williams & Wilkins, Philadelphia, PA, 2004, pp 342-351.

18. Henry S, Guyer RD: Revision Decompressive / Disc Surgery. In: Frymoyer J et al (ed): The Adult and Pediatric Spine. Lippincott Williams & Wilkins, Philadelphia, PA. 2004; pp 1153-1163.

19. Guyer RD, Corbin TP: Minimally Invasive Posterior Fusion And Internal Fixation With ATAVI System. In: Kambin P (eds): Arthroscopic and Endoscopic Spinal Surgery; Text & Atlas. Humana Press, Totowa, NJ, 2005; pp 227-238.
20. Guyer RD, Zigler JE (Editors): Spinal Arthroplasty: A New Era in Spine Care. Quality Medical Publishing. St. Louis, MO; 2005.

21. Guyer RD Burd TA, Hochschuler SH, McAfee PC: Total Disc Replacement. In: Guyer RD, Zigler JE (eds): Spinal Arthroplasty: A New Era in Spine Care. Quality Medical Publishers, St. Louis, MO, 2005; pp 181-224.

22. Guyer RD: InFix Interbody Fusion Device. In: Haid RW Jr, Fessler R, McLaughlin MR (eds) Interbody Fusion Techniques: Cages, Dowels, and Grafts. Quality Medical Publishing, Inc. St. Louis, MO, 2005; pp 133-147.

23. McAfee PC, Guyer RD: CHARITE Artificial Disc Replacement. In: Corbin TP, Connolly PJ, Yuan H, Bao Q-B, Boden SD (eds): Emerging Spine Surgery Technologies: Evidence and Framework for Evaluating New Technology. Quality Medical Publishing, St. Louis, MO, 2005; pp 527-562.

24. Johnson MC, Guyer RD: Revision Strategies: Failed Instrumentation. In Herkowitz H, Garfin S, Eismont FJ, Bell GR, Balderston RA (eds) The Spine 5th Edition, Elsevier, London; 2007.

25. Guyer RD, Ohnmeiss DD: Disc Replacement. In: Slipman CW, Simeone F, Derby R, Mayer TG (eds): Interventional Spine: An Algorithmic Approach. Saunders Elsevier, Philadelphia, Pennsylvania; 2008; pp. 1389-1396.

26. Dickerman RD, Guyer RD: Intraoperative EMG Monitoring. In Levine A, Eismont F, Garfin S, Zigler J (Eds): Spine Trauma. Elsevier; London; in press.

27. Guyer RD: Impliant TOPS: Total Posterior Element Replacement. In Szpalski M, Gunzburg R, Le Huec J-C, Brayda-Bruno M (ed): Nonfusion Technologies in Spine Surgery; Lippincott Williams and Wilkins, Philadelphia, 2007, pp. 221-224.

28. Guyer RD, Craig L: U.S. Update of CHARITÉ One Year After FDA Approval. In Szpalski M, Gunzburg R, Le Huec J-C, Brayda-Bruno M (ed): Nonfusion Technologies in Spine Surgery; Lippincott Williams and Wilkins, Philadelphia, 2007, pp. 151-157.

29. Guyer RD, Roybal R: Disc Arthroplasty: The Charite´ Study-What Does It Really Mean?

In Resnick DK, Wang J, Haid RW (eds): Surgical Management of Low Back Pain, 2nd Edition Theime, New York, New York; in press.

30. Guyer RD, Block AR: Multidisciplinary Chronic Pain Management as an Alternative to Surgery. In: Schatman M (Ed): Multidisciplinary Chronic Pain Management: A Guidebook for Program Development and Excellence of Treatment. Informa Healthcare, New York, 2007.

31. Guyer RD, Ohnmeiss DD: Socioeconimic Imapct of Motion Preservation Technology. In Yue, Bertagnoli R, McAfee PC, An H (eds): Motion Preservation Surgery of the Spine: Advanced Techniques and Controversies. Elsevier, Philadelphia, PA; in press.
32. Guyer RD, Roush TF: Fusion: Combined Anterior-Posterior Approach. In: Phillips FM, Lauryssen C (eds): The Lumbar Intervertebral Disc. Thieme Medical; New York, New York, in press.

33. Guyer RD, Ohnmeiss DD: How Disc Replacement Fits in the Treatment Algorithm for Degenerative Disc Disease: Refining Indications for Disc Replacement. In Szpalski M, Gunzburg (ed): Nonfusion Technologies in Spine Surgery; Lippincott Williams and Wilkins, Philadelphia, in press.

34. Guyer RD, Ohnmeiss DD: Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. In: Szpalski M, Gunzburg R (eds): Nonfusion Technologies in Spine Surgery. Lippincott Williams and Wilkins, Philadelphia, Pennsylvania; in press.

35. Guyer RD, Ohnmeiss DD, Strauss K: Overview of Pedicle Screw Based Posterior Dynamic Stabilization Systems. In: Szpalski M, Gunzburg R (eds): Nonfusion Technologies in Spine Surgery. Lippincott Williams and Wilkins, Philadelphia, Pennsylvania; in press.

36. Yue JJ, Guyer RD, Johnson JP, Khoo LT, Hochschuler SH (eds): The Comprehensive Treatment of the Aging Spine: Minimally Invasive and Advanced Techniques. Elsevier, in press.

37. Shellock J, Guyer RD: Lumbar Disc Arthroplasty: Indications and Contraindications. In: Yue JJ, Guyer RD, Johnson JP, Khoo LT, Hochschuler SH (eds): The Comprehensive Treatment of the Aging Spine: Minimally Invasive and Advanced Techniques. Elsevier, in press.

38. Guyer RD, Glenn J: Anterior Approach to the Lumbar Spine. The Spine.

PRESENTATIONS

1. Guyer RD: Pulmonary Embolism Prophylaxis in Total Hip Patients. Alumni Day, University of Pennsylvania, Department of Orthopedic Surgery. May, 1979; Philadelphia, Pennsylvania.

2. Guyer RD: Metabolic Bone Disease. Orthopedic Conferences at the University of Pennsylvania. November, 1978; Philadelphia, Pennsylvania.

3. Guyer RD: Brachial Plexus Injuries. Orthopedic Conferences at the University of Pennsylvania. January, 1978; Philadelphia, Pennsylvania.

4. Guyer RD: Biomechanics of the Hip. Orthopedic Conferences at the University of Pennsylvania. September, 1978; Philadelphia, Pennsylvania.

5. Guyer RD: Review of Metabolic Bone Disease. Orthopedic Conferences at the University of Pennsylvania. November, 1978; Philadelphia, Pennsylvania.

6. Guyer RD: Brachial Plexus Injuries. Orthopedic Conferences at the University of Pennsylvania. January, 1978; Philadelphia, Pennsylvania.

7. Guyer RD: Acute Arthritis of the Knee. Orthopedic Conferences at the University of Pennsylvania. January, 1979; Philadelphia, Pennsylvania.

8. Guyer RD: Fractures of the Thoracolumbar Spine. Orthopedic Conferences at the University of Pennsylvania. March, 1979; Philadelphia, Pennsylvania.

3. Guyer RD: Biophysical Augmentation of Fracture Healing with Electricity. Grand Rounds, The University of Texas Medical School at Houston. December, 1979; Houston, Texas.

4. Guyer RD: Simplified Radiographic Examination for Dislocated Shoulders. Alumni Day, University of Pennsylvania. May, 1980; Philadelphia, Pennsylvania.

5. Guyer RD: Orthopedic Management of Hemophilia. Perspectives in Management of Hemophilia. October, 1980.

6. Guyer RD: Electrical Stimulation of the Bone for the Treatment of Nonunion. Edward T. Smith Lectureship. November, 1980.

7. Guyer RD: Complication of Closed Intramedullary Rodding of Proximal Femoral Shaft. Western Orthopedic Association. October, 1981.

8. Wiltse LL, Glenn W, Spencer CW, Porter IS, Guyer RD: Alar Transverse Process Impingement of L5 Nerve Root or the Far-Out Syndrome. International Lumbar Spine Society Meeting. June, 1982; Toronto, Canada.

9. Guyer RD: Nerve Impingement Syndromes of the Lumbar Spine. Orthopedic Grand Rounds Southwestern School of Medicine, Division of Orthopedic Surgery. September, 1982; Dallas, Texas.

10. Guyer RD: Orthopedic Injuries to the Extremities. Texas Trial Lawyers Association. March, 1984; Dallas, Texas.

11. Guyer RD: Spinal Disorders – Neck and Back. Orthopedic Surgery Lecture, Introduction to Disease Course, Southwestern Medical School. April, 1984; Dallas, Texas.

12. Guyer RD: Management of Chymopapain Failures. Western Orthopedic Association, September, 1984; Forth Worth, Texas.

13. Guyer RD: Treatment of Low Back Pain. Kaufman County Medical Society. November, 1985; Terrell, Texas.

14. Sachs BL, Spivey MA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH, Vanharanta H, Aprill C, Terry A, Selby D, Mooney V: Dallas Discogram Description: A New Classification of CT/Discography. International Society for the Study of Lumbar Spine. June, 1986; Dallas, Texas.

15. Sachs BL, Spivey MA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH, Vanharanta H, Aprill C, Terry A, Selby D, Mooney V: A Clinical Grading System of CT/Discography for Diagnostic Value in Low Back Problems. International Society for the Study of Lumbar Spine. June, 1986; Dallas, Texas.

16. Vanharanta H, Sachs BL, Spivey MA, Hochschuler SH, Guyer RD, Rashbaum RF, Johnson R: Disc Degeneration and Leaking of Annulus in Reproduction of Back Pain During Discography, a CT/Discographic Study. International Society for the Study of Lumbar Spine. June, 1986; Dallas, Texas.

17. Sachs BL, Spivey MA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH, Vanharanta H, Aprill C, Terry A, Selby D, Mooney V: Dallas Discogram Description: A New Classification of CT/Discography. North American Spine Society. July, 1986; Bolton Landing, New York.

18. Vanharanta H, Sachs BL, Spivey MA, Hochschuler SH, Guyer RD, Rashbaum RF, Johnson R: Disc Degeneration and Leaking of Annulus in Reproduction of Back Pain During Discography, a CT/Discography Study. North American Spine Society. July, 1986; Bolton Landing, New York.

19. Guyer RD: Discography and CT/Discography. Clinical Orthopedic Society. October, 1986; Forth Worth, Texas.

20. Guyer RD: The Far-Out Syndrome. The John Hopkins University Lectureship. November, 1986.

21. Sachs BL, Spivey MA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH, Vanharanta H, Aprill C, Terry A, Selby D, Mooney V: A Clinical Grading System of CT/Discography for Diagnostic Values in Low Back Problems. Federation of Spine Associations, January 1987, San Francisco, California.

22. Loguidice VA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH: Anterior Lumbar Interbody Fusions. Texas Medical Association. May, 1987; Houston, Texas.
23. Sachs BL, Vanharanta H, Spivey MA, Guyer RD, Hochschuler SH, Rashbaum RF: Technique of CT/Discography. International Society for the Study of the Lumbar Spine. May, 1987; Rome, Italy.

24. Loguidice VA, Guyer RD, Johnson RG, Rashbaum RF, Hochschuler SH, Stith WJ, Ohnmeiss DD: Anterior Lumbar Interbody Fusions. North American Spine Society. June, 1987; Banff, Canada.

25. Guyer RD, Collier R, Rashbaum RF, Hochschuler SH, Stith WJ, Ohnmeiss DD, Loguidice VA: Extraosseous Spinal Lesions Mimicking Disc Disease. North American Spine Society. June, 1987; Banff, Canada.

26. Vanharanta H, Sachs BL, Spivey M, Rashbaum RF, Guyer RD, Hochschuler SH, Ohnmeiss DD, Johnson RG, Mooney V: Comparison of Disc Narrowing with Discographic Degenerative Changes and Pain Provocation. North American Spine Society. June, 1987; Banff, Canada.

27. Hochschuler SH, Rashbaum RF, Guyer RD, Stith WJ, Ohnmeiss DD: Proplast Reconstruction of Iliac Crest Defects. North American Spine Society. June, 1987; Banff, Canada.

28. Guyer RD: Intra-Spinal Tumors Mimicking Herniated Disc Disease. Western Orthopaedic Association Meeting. September, 1987; Dallas, Texas.

29. Guyer RD: Extraosseous Spinal Lesions Mimicking HNP. Grand Rounds, University of Texas Health Science Center, Southwestern Medical School. March, 1988; Dallas, Texas.

30. Guyer RD, Collier R, Hochschuler SH, Rashbaum RF, Regan JJ, Stith WJ, Ohnmeiss DD: Post-discography Discitis. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

31. Vanharanta H, Sachs BL, Spivey M, Aprill C, Ohnmeiss DD, Guyer RD, Rashbaum RF, Hochschuler SH, Stith WJ, Mooney V: Disc Deterioration in Low Back Syndromes: A Prospective, Multi-center CT/Discography Study. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

32. Lonstein MA, Johnson R, Guyer RD: Posterior Lumbar Fusion and Instrumentation. Texas Medical Association. May, 1988; San Antonio, Texas.

33. Hopp S, Johnson R, Guyer RD: Microscopic Discectomy and Fusion for Cervical Syndrome. Texas Medical Association. May, 1988; San Antonio, Texas.

34. Vanharanta H, Sachs BL, Spivey M, Aprill C, Ohnmeiss DD, Guyer RD, Rashbaum RF, Hochschuler SH, Stith WJ, Mooney V: Disc Deterioration in Low Back Syndromes: A Prospective Multi-center CT/Discography Study. North American Spine Society. July, 1988; Colorado Springs, Colorado.

35. Vanharanta H, Ohnmeiss DD, Stith WJ, Regan JJ, Hochschuler SH, Guyer RD, Mooney V: The Effect of Repeated Trunk Extension and Flexion Movements As Seen By CT/Discography. North American Spine Society. July, 1988; Colorado Springs, Colorado.
36. Guyer RD, Collier R, Hochschuler SH, Rashbaum RF, Regan JJ, Stith WJ, Ohnmeiss DD: Post-discography Discitis. North American Spine Society. July, 1988; Colorado Springs, Colorado.

37. Shea D, Stith WJ, Ohnmeiss DD, Hochschuler SH, Guyer RD, Rashbaum RF: The Effect of Sensory Deprivation on the Reduction of Pain in Chronic Low Back Patients. North American Spine Society. July, 1988; Colorado Springs, Colorado.

38. Guyer RD: Symptoms and Pathogenisis of Lumbar Herniated Disc. Automated Percutaneous Discectomy Workshop, Division of Orthopaedic Surgery, University of Texas Southwestern Medical School. November, 1988; Dallas, Texas.

39. Vanharanta H, Ohnmeiss DD, Stith WJ, Regan JJ, Hochschuler SH, Guyer RD, Mooney V: Effect of Repeated Trunk Extension and Flexion Movements as Seen by CT/Discography. Federation of Spine Associations. February, 1989; Las Vegas, Nevada.

40. Vanharanta H, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Rashbaum RF, Sachs BL: The Effect of Lumbar Level in Painful Disc Deterioration. International Society for the Study of the Lumbar Spine. May, 1989; Kyoto, Japan.

41. Guyer RD: Evaluation and Management of Lumbar Disc Disease. American Academy of Pain Medicine. November, 1989; Dallas, Texas.

42. Guyer RD: Injection Techniques. Keystone Spine Meeting. March, 1990; Keystone, Colorado.

43. Guyer RD: Post-op Care. Keystone Spine Meeting. March, 1990; Keystone, Colorado.

44. Guyer RD: Spinal Surgery. Resident Teaching Conference. April, 1990; Dallas, Texas.

45. Guyer RD: State of the Art Diagnostic Techniques for the Lumbar Spine. American Bar Association – Work Place Remedies II. May, 1990; Dallas, Texas.

46. Guyer RD: Evaluation of Low Back Pain. Texas College of Osteopathic Medicine. May, 1990; Fort Worth, Texas.

47. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. North American Spine Society. August, 1990; Monterey, California.

48. Guyer RD: Arthroscopic Microdiscectomy. North American Spine Society Instructional Course. August, 1990; Monterey, California.

49. Guyer RD: Selective Discography, Discography, and Pain Provocation. Arthroscopic Microdiscectomy Course. November, 1990; Philadelphia, Pennsylvania.

50. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: The Use of Donor Femur Grafts in Anterior Lumbar Interbody Fusion. American Academy of Orthopaedic Surgeons. March, 1991; Anaheim, California.
51. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. Federation of Spine Associations. March, 1991; Anaheim, California.

52. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. Mid-American Orthopaedic Association. April, 1991; Palm Springs, California.

53. Guyer RD, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Regan JJ: Comparison of Single Level Arthroscopic Microdiscectomy to Laminectomy and Discectomy. International Intradiscal Therapy Society. April, 1991; Houston, Texas.

54. Guyer RD: Metabolic Bone Disease. University of Texas Southwestern Medical School; Orthopaedic Board Examination Review Course. April, 1991; Dallas, Texas.

55. Herbert M, Pepper J, Guyer RD: Changes in Intervertebral Disc Pressure with Flexion After L5-S1 Posterior Instrumentation. International Society for the Study of the Lumbar Spine. May, 1991; Heidelberg, Germany.

56. Guyer RD, Hochschuler SH, Ohnmeiss DD, Stith WJ, Spivey MA, Castleman C, Rashbaum RF, Regan JJ: Cine MRI to Visualize Functional Pathology in the Spine. North American Spine Society. August, 1991; Keystone, Colorado.

57. Guyer RD, Ohnmeiss DD, Stith WJ, Bonnick SL, Hochschuler SH, Rashbaum RF, Regan JJ: Changes in Vertebral Bone Density Following Lumbar Spine Fusion and Post-operative Bracing. North American Spine Society. August, 1991; Keystone, Colorado.

58. Guyer RD: Comparison of Costs and Effectiveness of Arthroscopic Microdiscectomy to Laminectomy with Discectomy. North American Spine Society. August, 1991; Keystone, Colorado.

59. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: Comparison of Single Level Arthroscopic Microdiscectomy to Laminectomy and Discectomy. North American Spine Society. August, 1991; Keystone, Colorado.

60. Rashbaum RF, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Regan JJ: Initial Results of Spinal Cord Stimulation in Chronic Pain Patients. North American Spine Society. August, 1991; Keystone, Colorado.

61. Hochschuler SH, Guyer RD, Ohnmeiss DD, Rashbaum RF, Regan JJ: Single-level Stabilization with Femur Grafts. North American Spine Society. August, 1991; Keystone, Colorado.

62. Regan JJ, Shelokov AP, Guyer RD, Hochschuler SH, Rashbaum RF: Use of the Texas Scottish Rite Hospital System Anteriorly in Adult Scoliosis. North American Spine Society. August, 1991; Keystone Colorado.
63. Regan JJ, Mack M, Shelokov AP, Guyer RD, Hochschuler SH, Rashbaum RF: Thoroscopy in the Diagnosis and Treatment of Lesions in the Dorsal Spine. North American Spine Society. August, 1991; Keystone Colorado.

64. Guyer RD: Mechanisms of Pain Relief with Arthroscopic Microdiscectomy. International Society for Minimally Invasive Spine Surgery. November, 1991; Philadelphia, Pennsylvania.

65. Guyer RD, Hochschuler SH, Ohnmeiss DD, Stith WJ, Spivey MA, Castleman C, Rashbaum RF, Regan JJ: Dynamic MRI: A New Technique to Identify Functional Pathology in the Spine. Federation of Spine Associations. February, 1992; Washington, D.C.

66. Regan JJ, Shelokov AP, Guyer RD, Hochschuler SH, Rashbaum RF: Use of the Texas Scottish Rite Hospital System Anteriorly in Adult Scoliosis. American Academy of Orthopaedic Surgeons. February, 1992; Washington, D.C.

67. Regan JJ, Shelokov AP, Alfano S, Guyer RD, Hochschuler SH, Rashbaum RF: Use of the Texas Scottish Rite Hospital System Anteriorly in Adult Scoliosis. Scoliosis Research Society/North American Spine Society joint conference on Pedicle Fixation of the Lumbar Spine. April, 1992; Phoenix, Arizona.

68. Guyer RD: Metabolic Bone Disease. University of Texas Southwestern Medical School; Orthopaedic Board Examination Review Course. June, 1992; Dallas, Texas.

69. Floyd T, Hochschuler SH, Vanharanta H, Ohnmeiss DD, Guyer RD: The Relationship of Facet Tropism to Degenerative Disc Disease. North American Spine Society. July, 1992; Boston, Massachusetts.

70. Bogdanffy GM, Ohnmeiss DD, Guyer RD, Griffith SL: Bone Mineral Density Above a Multi-Segmental Lumbar Spinal Fusion. American Society for Bone and Mineral Research. September, 1992; Minneapolis, Minnesota.

71. Floyd T, Vanharanta H, Ohnmeiss DD, Guyer RD, Hochschuler SH: The Relationship of Facet Tropism to Degenerative Disc Disease. Schriners Residents and Fellows Conference. November, 1992; New Orleans, Louisiana.

72. Block A, Guyer RD, Hochschuler SH, Ohnmeiss DD, Vanharanta H: Discographic Pain Report: Influence of Psychological Factors. American Academy of Orthopaedic Surgeons. February, 1993; San Francisco, California.

73. Guyer RD: Discordant CT/Discography Results: Psychological Factors Play a Role. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France.

74. Rashbaum RF, Ohnmeiss DD, Bogdanffy GM, Guyer RD: Prospective Outcome Evaluation of Spinal Cord Stimulation for Intractable Leg Pain. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France.
75. Block AR, Vanharanta H, Ohnmeiss DD, Guyer RD, Hochschuler SH: Discordant CT/Discography Results: Psychological Factors Play a Role. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France.

76. Perim D, Guyer RD, Elliott FT: Lumbar Laminectomy-Discectomy: Factors Associated with Increased Costs and Morbidity. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France.

77. Bogdanffy GM, Ohnmeiss DD, Griffith SL, Guyer RD: Relationship and Reliability of Ultrasound and Dual Energy X-Ray Absorptiometry (DXA) for the Assessment of Bone. American Society for Bone and Mineral Research. September, 1993; Tampa, Florida.

78. Ohnmeiss DD, Hochschuler SH, Guyer RD, Weinhoffer SL: Laser Disc Decompression: The Importance of Proper Patient Selection. North American Spine Society. October, 1993; San Diego, California.

79. Weinhoffer SL, Guyer RD, Herbert M, Griffith SL, Ohnmeiss DD: In Vitro Intradiscal Pressure Measurements above a Simulated Fusion. North American Spine Society. October, 1993; San Diego, California.

80. Rashbaum RF, Ohnmeiss DD, Bogdanffy GM, Guyer RD: Prospective Outcome Evaluation of Spinal Cord Stimulation for Intractable Leg Pain. North American Spine Society. October, 1993; San Diego, California.

81. Regan JJ, Mack M, Picetti GD III, Guyer RD, Hochschuler SH, Rashbaum RF: A Comparison of Video-assisted Thoracoscopic (VAT) to Open Thoracotomy in Thoracic Spinal Surgery. North American Spine Society. October, 1993; San Diego, California.

82. Ohnmeiss DD, Hochschuler SH, Guyer RD, Weinhoffer SL: Laser Disc Decompression: The Importance of Proper Patient Selection. Federation of Spine Associations. February, 1994; New Orleans, Louisiana.

83. Guyer RD: Metabolic Bone Disease. University of Texas Southwestern Medical School; Orthopaedic Board Examination Review Course. May, 1994; Dallas, Texas.

84. Ohnmeiss DD, Vanharanta H, Guyer RD, Hochschuler SH: The Relationship between Pain Drawings and Discographic Pain Responses. International Society for the Study of the Lumbar Spine. June, 1994; Seattle, Washington.

85. Guyer RD, Ruoff M, Ohnmeiss DD: Combined Anterior-posterior Lumbar Spinal Fusion: Is it Safe? North American Spine Society; October, 1994; Minneapolis, Minnesota.

86. Vanharanta H, Ohnmeiss DD, Guyer RD: Are Lumbar Flexion-Extension Films Useful in Identifying Discogenic Pain? North American Spine Society; October, 1994; Minneapolis, Minnesota.

87. Novotny SR, Guyer RD, Regan JJ, Ohnmeiss DD: Laparoscopic Assisted Anterior Lumbar Interbody Fusion. North American Spine Society; October, 1994; Minneapolis, Minnesota.

88. Novonty SR, Guyer RD, Regan JJ: Laparoscopic Assisted Anterior Lumbar Interbody Fusion. American Academy of Orthopaedic Surgeons. February, 1995; Orlando, Florida. Blumenthal SL, Regan JJ, Guyer RD, Novotny S, Ohnmeiss DD: Laparoscopic Assisted Anterior Lumbar Interbody Fusion. International Society for the Study of the Lumbar Spine. June, 1995; Helsinki, Finland.

89. Guyer RD: The Myths of Spine Surgery. Neuroscience. August, 1995; Plano, Texas.

90. Guyer RD, Ohnmeiss DD, Mason SL, Shelokov AP: The Relationship of Cervical Discographic Pain Responses and Radiographic Images. North American Spine Society. October, 1995; Washington, D.C.

91. Mason SL, Shelokov AP, Guyer RD, Ohnmeiss DD: Complications of Cervical Discography: Findings in a Large Series. North American Spine Society. October, 1995; Washington, D.C.

92. Bogdanffy GM, Kime C, Guyer RD: Percutaneous Lumbar Discectomy: A Comparison of Two Nuclear Aspiration Systems In Vitro. North American Spine Society. October, 1995; Washington, D.C.

93. Mason SL, Shelokov AP, Guyer RD, Ohnmeiss DD: Complications of Cervical Discography: Findings in a Large Series. American Academy of Orthopaedic Surgeons. February, 1996; Atlanta, Georgia.

94. Guyer RD: Mini Open Spinal Fusion. New Frontiers in Spine Surgery. April, 1996; Strasbourg, France.

95. Gronblad M, Virri J, Ronkko S, Kiviranta I, Vanharanta H, Seitsalo S, Rashbaum RF, Guyer RD: A Controlled Biochemical and Immunohistochemical Study of Human Synovial-Type (Group 11) Phospholipase A2 and Inflammatory Cells in Macroscopically Normal, Degenerated, and Herniated Human Lumbar Disc Tissue. (Volvo Award Winning Paper) International Society for the Study of the Lumbar Spine. June, 1996; Burlington, Vermont.

96. Block AR, Ware D, Ohnmeiss DD, Guyer RD, Pladjewitz C: Initial Results from a Psycho-Social Screening Package for Spine Surgery Candidates. International Society for the Study of the Lumbar Spine. June, 1996; Burlington, Vermont.

97. Guyer RD, Ohnmeiss DD, Vanharanta H, Mason SL: Are Results of Lumbar and Cervical Discography Similar? Spine Across the Sea (NASS/JSRS). March, 1997; Hawaii.

98. Guyer RD: Reimbursement: Marketing vs. Survival. American Pain Society/North American Spine Society. April, 1998; Charleston, South Carolina.

99. Massoud B, Ohnmeiss DD, Rinn C, Guyer RD, Hochschuler SH, Rashbaum RF, Blumenthal SL, Zigler JE, Regan JJ, Fulp T: Results of Hardware Removal in the Lumbar Spine and the Role of Diagnostic Hardware Injection. Dialogue and Controversy in Spinal Surgery. April, 1998; Stove Mountain, Georgia.

100. Guyer RD: Postero-Lateral Fusion: Indications & Technique. Complications in Spinal Fusion. March, 1999; Olympic Valley, California.
102. Simpson NS, Blumenthal SL, Guyer RD, Ohnmeiss DD, Risk DE: Anterior Lumbar Interbody Fusion with Threaded Fusion Cages: Technique, Feasibility, and Safety. American Spinal Injury Association. April, 1999; Atlanta, Georgia.

103. Guyer RD: Minimally Invasive Spine Surgery. American Academy of Orthopaedic Surgeons Practical Anatomy and Surgery Technique Workshop. April, 1999; St. Louis, Missouri.

104. Guyer RD: Degenerative Lumbar Spondylolisthesis. Clinical Lecture. University of Texas Southwestern Medical Center. May, 1999; Dallas, Texas.

105. Guyer RD: Metabolic Bone Disease. University of Texas Southwestern Medical School; Orthopaedic Board Examination Review Course. May, 1999; Dallas, Texas.

106. Guyer RD: Laparoscopic vs. Open Procedures. Minimally Invasive Technologies: Medicine in the 21st Century Symposium. May, 1999; Dallas, Texas.

107. Sengupta D, Ohnmeiss DD, Mulholland R, Webb J, Guyer RD, Zigler JE, Hochschuler SH: Fulcrum Assisted Soft Stabilization (FASS) in the Treatment of Activity Related Low Back Pain – A New Concept. International Society for the Study of the Lumbar Spine. June, 1999; Kona, Hawaii.

108. Guyer RD, Goodwin C, Ohnmeiss DD, Guthner D: Capacitively Coupled stimulation for Lumbar Spine Fusion: Clinical Improvement Analysis from a Randomized Double-Blind Trial. International Society for the Study of the Lumbar Spine. June, 1999; Kona, Hawaii.

109. Block AR, Guyer RD, Rashbaum RF, Hochschuler SH, Ohnmeiss DD: Use of Presurgical Psychosocial Screening to Predict Spine Surgery Outcome. North American Spine Society. October, 1999; Chicago, Illinois.

110. Guyer RD: Lumbar Discography: Indications and Efficacy. Symposium on Lumbar Discogenic Disease – American Academy of Orthopaedic Surgeons. March, 2000; Orlando, Florida.

111. Guyer RD: Lumbar Interbody Fusion Cages in the Management of Chronic Low Back Pain. JPSSSTS Conference. September, 2000; Tokyo, Japan.

112. Regan JJ, Ohnmeiss DD, Hochschuler SH, Blumenthal SL, Guyer RD: Comparison of Laparoscopic to Mini-Open Fusion at the L4-5 Level. North American Spine Society. October, 2000; New Orleans, Louisiana.

113. Corbin T, Guyer RD, Ohnmeiss DD: Outcomes of Spinal Fusion Supplemented with Capacitively Coupled Electrical Stimulation. North American Spine Society. October, 2000; New Orleans, Louisiana.

114. Blumenthal SL, McAfee PC, Hochschuler SH, Guyer RD, Fedder I, Ohnmeiss DD: Prospective Evaluation of the SB Charité III Disc Prosthesis. Spine Society of Australia. April, 2001; Australia. Burton DC, Ohnmeiss DD, Zigler JE, Blumenthal SL, Rashbaum RF, Guyer RD, Regan JJ: Anterior Cervical Discectomy and Fusion with Allograft Bone and Plate Fixation. American Spinal Injury Association. May, 2001; Long Beach, California.

115. Hisey MS, Bash J, Ohnmeiss DD, Zigler JE, Guyer RD, Blumenthal SL, Regan JJ, Hochschuler SH, Rashbaum RF: Is There an Association Between Using ADCON-LTM and the Incidence of Recurrent Disc Herniation? American Spinal Injury Association. May, 2001; Long Beach, California.

116. Guyer RD: General Indications and Contraindications for Disc Replacement (Symposium: Artificial Intervertebral Discs and Beyond). North American Spine Society. November, 2001; Seattle, Washington.

117. Guyer RD: Early US Experience with the Charité Artificial Disc. (Symposium) American Academy of Orthopaedic Surgeons. February, 2002; Dallas, Texas.

118. Blumenthal SL, Guyer RD, Hochschuler SH, Ohnmeiss DD: Preliminary Results of a Prospective Study Using the SB Charité III Disc Prosthesis. Spine Society of Australia. April, 2002; Melbourne, Australia.

119. Ohnmeiss DD, Guyer RD, Hochschuler SH, Rashbaum RF, Blumenthal SL, Zigler JE: Influence of Scan Projection on the Diagnosis of Osteoporosis in a Low Back Pain Population. Meeting of the Americas. April, 2002; New York, New York.

120. Henry S, Ohnmeiss DD, Guyer RD, Zigler JE, Chang Y, Rashbaum RF, Blumenthal SL: Outcome of Anterior Cervical Fusion For Discographically Proven Pain. Meeting of the Americas. April, 2002; New York, New York.

121. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: US Experience with the SB Charité Artificial Disc. Spinal Arthroplasty Society. May, 2002; Montpellier, France.

122. Guyer RD: The Multidisciplinary Approach to Work Comp Injuries. Spine Care of the Injured Worker conference. June, 2002; Plano, Texas.

123. Guyer RD: Spine Anatomy and Disc Related Pain. Spine Care of the Injured Worker conference. June, 2002; Plano, Texas.

124. Guyer RD: SB Charite III: Cirugia de Reemplazo Por Disco Artificial. Curso Teorico Practico. August, 2002; Santiago, Chile.

125. Guyer RD: Diagnostic Work-up of Spinal Instability. Dynamic Spine Stabilization. October, 2002; Plano, Texas.

126. Guyer RD: Assessing the Damage: Diagnostic Imaging. Managing the Low Back “Train Wreck” Conference. November, 2002; Plano, Texas.

127. Guyer RD: Experience with Allografts in Spine Surgery. What’s New in Orthopaedic Grafting Techniques and Tissue Banking. November, 2002; Dallas, Texas.

128. Guyer RD: Assessing Axial Low Back Pain, Where Are We? (Symposium: Stabilizing Low Back Pain). North American Spine Society; November, 2002; Montreal, Canada.
130. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: Prospective outcome evaluation of a Total Disc Replacement. Spine Society of Australia. April, 2003; Canberra, Australia.

131. Guyer RD: The Role of ALIF. Spinal Arthroplasty Society, May, 2003; Phoenix, Arizona.

132. Guyer RD: Results of SB Charité: Historical. Spinal Arthroplasty Society, May, 2003; Phoenix, Arizona.

133. Guyer RD: Clinical and Radiologic Diagnostics for Spinal Motion Abnormalities. Spinal Arthroplasty Society, May, 2003; Phoenix, Arizona.

134. Guyer RD: Fusion vs. Motion: Pro Fusion. (Debate) Spinal Arthroplasty Society, May, 2003; Phoenix, Arizona.

135. Guyer RD: Disc Replacement and Early US Results. Brazilian Spine Society. June, 2003; Fortaleza, Brazil.

136. Guyer RD: Vertebroplasty. Brazilian Spine Society. June, 2003; Fortaleza, Brazil.

137. Guyer RD, Davis R, Songer M, Frederickson B: The Efficacy of a New Modular Cage for Anterior Lumbar Interbody Fusion. International Meeting on Advanced Spinal Techniques (IMAST), July, 2003; Rome, Italy.

138. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: Prospective Outcome Evaluation of a Total Disc Replacement. Spine Across the Sea. July, 2003; Maui, Hawaii.

139. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: Preliminary Experience with the SB Charité III Disc Prosthesis. World Spine. August 2003; Chicago, Illinois.

140. Guyer RD, Davis R, Songer M, Frederickson B: The Efficacy of a New Modular Cage for Anterior Lumbar Interbody Fusion. World Spine. August 2003; Chicago, Illinois.

141. Guyer RD, Davis R, Songer M, Frederickson B: The Efficacy of a New Modular Cage for Anterior Lumbar Interbody Fusion. North American Spine Society. October, 2003; San Diego, California.

142. Guyer RD, Hochschuler SH, Ohnmeiss DD, Blumenthal SL: Prospective Outcome Evaluation of Total Disc Replacement: A 12- to 24-Month Follow-Up Study. North American Spine Society. October, 2003; San Diego, California.

143. Guyer RD: SB Charité III Prospective Randomized U.S. Trial (Pre-course: Artificial Discs) North American Spine Society. October, 2003; San Diego, California.

144. Guyer RD: Clinical Diagnostics for Spinal Motion Abnormality. Dynamic Spine Stabilization. November, 2003; Plano, Texas.

145. Guyer RD: Unconstrained: Link SB Charité′ III Disc (U.S. Experience). Dynamic Spine Stabilization. November, 2003; Plano, Texas.

146. Guyer RD: Principles of Dynamic Stabilization. Non-Fusion Technology “A State of The Art Debate”. December, 2003; New York, New York/Zurich, Switzerland. Guyer RD: Preliminary results of the prospective randomized FDA Study Comparing Fusion Versus SB Charité Total Disc Arthroplasty. Non-Fusion Technology “A State of The Art Debate”. December, 2003; New York, New York/Zurich, Switzerland.

147. Guyer RD, Hochschuler SH, Blumenthal SL, Ohnmeiss DD: Prospective Outcome Evaluation of Total Disc Replacement. American Academy of Orthopaedic Surgeons. March, 2004; San Francisco, California.

148. Geisler FH, Blumenthal SL, McAfee PC, Guyer RD, Hochschuler SH, Garcia R, Regan JJ: Prospective, Randomized, Multicenter Trial of Artificial Disc vs. Fusion for Single Level Lumbar Degenerative Disc Disease: A 2-Year Follow-up IDE Study. Congress of Neurological Surgeons. 2004; San Francisco, California.

149. McAfee PC, Cunningham BW, Holtsapple G, Bussard K, Guyer R, Blumenthal S, Dmitriev A, Maxwell JH, Isaza J, Regan J: A Prospective Randomized U.S. FDA Study of the Charité Disc Replacement – A Radiographic Outcome Analysis of 276 Consecutive Patients. Spine Society of Australia. April, 2004; Coolum, Australia.

150. Blumenthal S, McAfee P, Guyer R, Hochschuler S, Garcia R, Regan J, Ohnmeiss D: Randomized Control Trial of the Charité Artificial Disc vs. Fusion for Single Level Lumbar Degenerative Disc Disease: A Two-Year Follow-up Study. Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

151. Blumenthal SL, Sohn JM, Guyer RD, Hochschuler SH, Ohnmeiss DD: Range of Motion Analysis of the Lumbar Spine after Total Disc Replacement: A Prospective Two-Year Follow-Up Study. Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

152. Hochschuler SH, Whitaker C, Zigler JE, Guyer RD, Sachs BL, Blumenthal SL, Rashbaum RF, Ohnmeiss DD: Comparison of Return to Work Following Total Disc Arthroplasty vs. Fusion: A Prospective, Randomized Study. Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

153. Sachs BL, Gottlieb J, Guyer RD, Zigler JE, Rashbaum RF, Hochschuler SH, Blumenthal SL, Whitaker C, Ohnmeiss DD: Comparison of Complications Associated with Total Disc Replacement versus Lumbar Fusion at Two-year Follow-Up. Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

154. Guyer RD: Static Stabilization,Arthrodesis.What are the results as they compare to Arthroplasty?. North American Spine Society symposim at the Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

155. Guyer RD: Motion Preservation Systems: Tips on Matching the Right Device to the Right Patient. Implaint workshop at the Spinal Arthorplasty Society. Austria May, 2004; Vienna, Austria.

156. Guyer RD: Role of Lumbar Discography in the Pre-Op evaluation prior to Motion Sparing Surgery. North American Spine Society symposim at the Spinal Arthroplasty Society. May, 2004; Vienna, Austria.
158. Guyer RD: Range of Motion Analysis of the Lumbar Spine after Total Disc Replacement: A Prospective Two-Year Follow-Up Study. Spine Arthroplasty Society. May, 2004; Vienna, Austria.

159. Guyer RD: Principles of Dynamic Stabilization with Special Refernce to the Posteiror Column. 4th Dynesys Meeting. May, 2004; Vienna, Austria.

160. McAfee PC, Cunningham BW, Holtsapple G, Bussard K, Guyer R, Blumenthal S, Dmitriev A, Maxwell JH, Isaza J, Regan J: A Prospective Randomized U.S. FDA Study of the Charité Disc Replacement – A Radiographic Outcome Analysis of 276 Consecutive Patients. International Society for the Study of the Lumbar Spine. June, 2004; Porto, Portugal.

161. Guyer RD: Results of Charite Total Disc Replacement: Historical. Curso Internacional Chileno Norteamericano de Columna Vertebral. August, 2004; Santiago, Chile.

162. Guyer RD: History of Total Lumbar Disc Replacement. Curso Internacional Chileno Norteamericano de Columna Vertebral. August, 2004; Santiago, Chile.

163. Guyer RD: The Role of ALIF. Curso Internacional Chileno Norteamericano de Columna Vertebral. August, 2004; Santiago, Chile.

164. Guyer RD: Clinical and Radiological Diagnostics for Spinal Motion Abnormalities. Curso Internacional Chileno Norteamericano de Columna Vertebral. August, 2004; Santiago, Chile.

165. Guyer RD: Charite. Innovative Techniques in Spine Surgery. August, 2004; Los Cabos, Mexico.

166. Guyer RD: Surgical techniques and FDA data. International Symposium Non-Fusion techniques in Spinal Surgery. September, 2004; Milan, Italy.

167. Guyer RD: Unconstrained Lumbar Disc Prosthesis Long Term Follow-up. Nonfusion Techniques in Spinal Surgery. September, 2004; Milan, Italy.

168. Geisler FH, Blumenthal SL, McAfee PC, Guyer RD, Hochschuler SH, Garcia R, Regan JJ: Prospective, Randomized, Multicenter Trial of Artificial Disc vs. Fusion for Single Level Lumbar Degenerative Disc Disease: A 2-Year Follow-up IDE Study. Congress of Neurological Surgeons. 2004; San Francisco, California.

169. Blumenthal S, McAfee P, Guyer RD, Hochschuler S, Garcia R, Regan J, Ohnmeiss D: Prospective, Randomized, Multicenter Comparison of Artificial Disc vs. Fusion for Single Level Lumbar Degenerative Disc Disease: A Two-Year Follow-up Study. North American Spine Society. October, 2004; Chicago, Illinois.

170. McAfee P, Cunningham BW, Holtsapple G, Bussard K, Guyer R, Blumenthal S, Dmitriev A, Maxwell J, Isaza J, Regan J: A Prospective Randomized FDA Study of the Charite Disc Replacement – A Radiographic Outcome Analysis of 276 Consecutive Patients. North American Spine Society. October, 2004; Chicago, Illinois.
171. Ohnmeiss DD, Guyer RD: 24-month Follow-up for Reporting Results of Spinal Implant Studies: Is This Guideline Supported by the Literature? North American Spine Society. October, 2004; Chicago, Illinois.

172. Guyer RD: The Case for Motion. Emerging Technologies in Spine Surgery. September – October, 2004; Washington, D.C.

173. Guyer RD: Clinical Experience with Charite. Emerging Technologies in Spine Surgery. September – October, 2004; Washington, D.C.

174. Guyer RD: MIS Approach with Atavi. 2nd Trans Atlantic Spine Congress “Innovations in Spine Surgery”. November, 2004; Dallas, Texas/Basel, Switzerland.

175. Guyer RD: SB Charité III Study. 2nd Trans Atlantic Spine Congress “Innovations in Spine Surgery”. November, 2004; Dallas, Texas/Basel, Switzerland.

176. Guyer RD: Lumbar Disc Replacement. Emerging Technologies in Spinal Care – Fifth Annual Herman Lohman Memorial Symposium. November, 2004; Livingston, New Jersey.

177. McAfee PC, Cunningham BW, Blumenthal SL, Guyer RD, Regan JJ: A Prospective Randomized FDA Study of the Charit Disc Replacement. February, 2005; Washington, D.C.

178. Guyer RD: Review of Lumbar Arthroplasty. North American Spine Society Spring Break. April, 2005; Bal Harbour, Florida.

179. Guyer RD: Total Posterior Element Replacement. North American Spine Society Spring Break. April, 2005; Bal Harbour, Florida.

180. Holt R, Majd M, Isaza J, Blumenthal S, McAfee P, Guyer R, Hochschuler S, Geisler F, Garcia R, Regan J: Complications of Lumbar Artificial Disc Replacement vs. Fusion: Results from the Randomized, Multicenter FDA IDE Study of the CHARITÉ Artificial Disc. Spinal Arthroplasty Society. May, 2005; New York, New York.

181. Regan JJ, McAfee PC, Guyer RD, Blumenthal SL, Geisler FH, Garcia R Jr., Maxwell JH: Evaluation of the Learning Curve Associated with Artificial Disc Replacement: Analysis from the Prospective, Randomized, Multicenter FDA IDE Study. Spinal Arthroplasty Society. May, 2005; New York, New York.

182. Elders GJ, Blumenthal SL, Guyer RD, Hochschuler SH, Rashbaum RF, Sachs BL, Zigler JE, Ohnmeiss DD: Effect of Facet Joint Arthrosis on Outcome after Artificial Disc Replacement. Spinal Arthroplasty Society. May, 2005; New York, New York.

183. Guyer RD, Tromanhauser S, Toselli R: An Economic Analysis of Lumbar Total Disc Replacement vs. Fusion. Spinal Arthroplasty Society. May, 2005; New York, New York.
184. Holt R, Majd M, Isaza J, Blumenthal S, McAfee P, Guyer R, Hochschuler S, Geisler F, Garcia R, Regan J. Complications of Lumbar Artificial Disc Replacement vs. Fusion: Results from the Randomized, Multicenter FDA IDE Study of the Charite ™ Artificial Disc. International Society for the Study of the Lumbar Spine. May, 2005; New York, New York.

185. Guyer R, Sohn J, Blumenthal S, Hochschuler S, Ohnmeiss D: Range of Motion Analysis of the Lumbar Spine after Total Disc Replacement: A Prospective Two-Year Follow-Up Study. International Society for the Study of the Lumbar Spine. May, 2005; New York, New York.

186. Whitaker C, Hochschuler S, Ohnmeiss D, Zigler J, Guyer R, Sachs B, Blumenthal S, Rashbaum R: Return to work following total disc replacement vs fusion: A prospective, randomized, comparison study. International Society for the Study of the Lumbar Spine. May, 2005; New York, New York.

187. Guyer RD: Live Surgery: Total Artificial Disc Prosthesis – Lumbar (broadcast from Switzerland). Live Instructional Non-Fusion Spine Course. May, 2005; New York, New York.

188. Guyer RD, Stoll J: Debate: Artificial Lumbar Disc vs. Traditional Fusion. Emerging Technologies in Spine Surgery. June, 2005; Las Vegas, Nevada.

189. Guyer RD: Charite. Innovative Techniques in Spine Surgery. July, 2005; Los Cabos, Mexico.

190. Regan JJ, McAfee PC, Guyer RD, Blumenthal SL, Geisler FH, Garcia R Jr., Maxwell JH: Evaluation of the Learning Curve Associated with Artificial Disc Replacement: Analysis from the Prospective, Randomized, Multicenter FDA IDE Study. International Meeting on Advanced Spine Techniques (IMAST). July, 2005; Banff, Alberta, Canada.

191. McAfee, PC, Geisler FH, Saidy S, Regan JJ, Guyer RD, Blumenthal SL, Fedder I, Tortolani J, Cunningham B: Revisability of the CHARITÉ Artificial Disc Replacement – Analysis of 347 Patients Enrolled in the US IDE Study of the CHARITÉ Artificial Disc. International Meeting on Advanced Spine Techniques (IMAST). July, 2005; Banff, Alberta, Canada.

192. Holt RT, Majd ME, Isaza JE, Blumenthal SL, McAfeePC, Guyer RD, Hochschuler SH: Complications of Lumbar Artificial Disc Replacement vs. Fusion: Results from the Randomized, Multicenter FDA IDE Study of the CHARITÉ Artificial Disc. International Meeting on Advanced Spine Techniques (IMAST). July, 2005; Banff, Alberta, Canada.

193. Guyer RD, Tromanhauser SG,Regan JJ, Tosell R: An Economic Analysis of Lumbar Total Disc Replacement vs. Fusion. International Meeting on Advanced Spine Techniques (IMAST). July, 2005; Banff, Alberta, Canada.

194. Guyer RD, Blumenthal SL, Hochschuler SH, McAfee PC, Regan JJ, Ohnmeiss DD: Prospective randomized comparison of total disc replacement to fusion a 24month followup FDA regulated study. World Spine. August, 2005; Brazil. Holt RT, SL Blumenthal, PC McAfee, ME Majd, RD Guyer, JE Isaza, SH Hochschuler, FH Geisler, R Garcia Jr., JJ Regan, DD Ohnmeiss: Complications and Clinical Outcome of Lumbar Artificial Disc Replacement vs. Fusion: Results from the Randomized, Multicenter FDA IDE Study of the CHARITÉ Artificial Disc. EuroSpine. September, 2005; Barcelona, Spain.

195. Blumenthal SL, McAfee PC, Guyer RD, Hochschuler SH, Garcia R Jr., Regan JJ, Ohnmeiss DD: Prospective Randomized Comparison of Total Disc Replacement to Fusion A 24-month Follow-Up FDA Regulated Study Combined with 720. EuroSpine. September, 2005; Barcelona, Spain.

196. Guyer RD: Clinical Issues with the Charite. Emerging Technology meeting. September, 2005; Washington, D.C.

197. McAfee P, Geisler F, Regan J, Blumenthal SL, Guyer R, Fedder I, Tortolani J, Cunningham B, Saiedy S: Revisability of the Charite Artificial Disc Replacement: Analysis of 347 Patients Enrolled in the US IDE Study of the Charite Artificial Disc. North America Spine Society. Sept-Oct, 2005; Philadelphia, Pennsylvania.

198. Holt RT, Majd M, Isaza J, Blumenthal S, McAfee P, Guyer R, Hochschuler S, Geisler F, Garcia R, Regan J: Complications of Lumbar Artificial Disc Replacement vs. Fusion: Results from The Randomized, Multicenter FDA IDE Study of the Charite Artificial Disc. North America Spine Society. Sept-Oct, 2005; Philadelphia, Pennsylvania.

199. Guyer R, Tromanhauser S, Toselli R: An Economic Analysis of Lumbar Total Disc Replacement vs. Fusion. North America Spine Society. Sept-Oct, 2005; Philadelphia, Pennsylvania.

200. Guyer RD: Flexible Posterior Rods (Symposium on Emerging Technology). North American Spine Society; Sept-Oct, 2005; Philadelphia, Pennsylvania.

201. Geisler FH, Holt RT, Majd ME, Isaza J, Blumenthal SL, McAfee PC, Guyer RD, Hochschuler SH, Garcia R, Regan JJ: Complications of Lumbar Artificial Disc Replacement versus Fusion: Results from the Randomized, Multicenter Food and Drug Administration Investigational Device Exemption Study of the CHARITE´ Artificial Disc. Congress of Neurological Surgeons. October, 2005; Boston, Massachusetts.

202. Geisler FH, McAfee PC, Saiedy S, Moore S, Blumenthal SL, Guyer RD, Regan JJ: The Revisability of the CHARITE´ Artificial Disc: Analysis of 688 Consecutive Patients from a Prospective, Randomized, Multicenter IDE Trial. Congress of Neurological Surgeons. October, 2005; Boston, Massachusetts.

203. Guyer RD: The TOPS System. Non Fusion Technologies in Spinal Surgery. November, 2005; Brussels, Belgium.

204. Guyer RD: Charite. Non Fusion Technologies in Spinal Surgery. November, 2005; Brussels, Belgium.

205. Guyer RD: Teeth Anchoring. 3rd Trans Atlantic Spine Congress “Innovations in Spine Surgery”. November, 2005; Dallas, Texas/Zurich, Switzerland.
207. Guyer RD: Update on Charite. 3rd Trans Atlantic Spine Congress “Innovations in Spine Surgery”. November, 2005; Dallas, Texas/Zurich, Switzerland.

208. Guyer RD: 5-year Follow-up of Patients Enrolled in the Charite Artificial Disc IDE Study. Spine Arthroplasty Summit. February, 2006; Salt Lake City, Utah.

209. Guyer RD: An Economic Analysis of Lumbar Arthroplasty vs. Fusion. Spine Arthroplasty Summit. February, 2006; Salt Lake City, Utah.

210. Guyer RD: Patient Selection: Patients Aged 45-60. Spine Arthroplasty Summit. February, 2006; Salt Lake City, Utah.

211. Guyer RD: Lumbar Disc Arthroplasty: Past, Present, and Future. John McCulloch Memorial Denver Spine Institute Winter Conference. February, 2006; Denver, Colorado.

212. Guyer RD: Difficult Decision Making in Total Disc Replacement. John McCulloch Memorial Denver Spine Institute Winter Conference. February, 2006; Denver, Colorado.

213. Guyer RD: Testing of Arthroplasty Devices: Clinical Outcomes. North American Spine Society Spring Break. March, 2006; San Diego, California.

214. Guyer RD: Spinal Stenosis: Surgical Decompression. North American Spine Society Spring Break. March, 2006; San Diego, California.

215. Guyer RD: Since FDA Approval Lumbar Disc Arthroplasty has been Extremely Successful for the Following Reasons. . . (Debate Session). Federation of Spine Associations. March, 2006; Chicago, Illinois.

216. Geisler F, Blumenthal S, Guyer R, McAfee P, Regan J: Alternative Statistical Testing Demonstrates Superiority of Lumbar Arthroplasty Clinical Outcomes at 2 Years vs. Fusion for the Treatment of One-Level Lumbar Degenerative Disc Disease at L4-5 or L5-S1. Spine Arthroplasty Society. May, 2006; Montreal, Canada.

217. Siddiqui S, Guyer R, Zigler J, Ohnmeiss D, Blumenthal S, Sachs B, Hochschuler S: Factors Related to the 20 Best and 20 Worst 24-months Outcomes of Total Disc Replacement in Prospective FDA-regulated Trials. Spine Arthroplasty Society. May, 2006; Montreal, Canada.

218. Guyer RD: Indications and Results of the S.B. Charite Arthroplasty Device Advanced Lumbar Spine Surgery: Minimally Invasive Surgery and Motion Preservation: A Hands-On Course. June, 2006; Memphis, Tennessee.

219. Lhamby J, Guyer R, Zigler J, Blumenthal S, Sachs B, Hochschuler S, Rashbaum R, Ohnmeiss D: Patients Undergoing Total Disc Replacement with Spinal Fusion at Different Lumbar Levels. International Society for the Study of the Lumbar Spine. Bergen, Norway; June, 2006.

220. McAfee, P, Geisler F, Saiedy S, Moore S, Regan J, Guyer R, Blumenthal S, Fedder I, Tortolani J, Cunningham B: Revisability of the Charité Artificial Disc Replacement – Analysis of 688 Patients Enrolled in the US IDE Study of the Charité Artificial Disc.

International Society for the Study of the Lumbar Spine. Bergen, Norway; June, 2006.
221. Guyer RD: Is Motion Preservation the way to go? (Debate: Pro) International Society for the Study of the Lumbar Spine. Bergen, Norway; June, 2006.

222. Guyer RD: Charite. Innovative Techniques in Spine Surgery. June, 2006; Los Cabos, Mexico.

223. Guyer RD: Indications and Results of the S.B. Charite Arthroplasty Device Advanced Lumbar Spine Surgery: Minimally Invasive Surgery and Motion Preservation: A Hands-On Course. June, 2006; Memphis, Tennessee.

224. Lhamby J, Guyer R, Zigler J, Blumenthal S, Sachs B, Hochschuler S, Rashbaum R, Ohnmeiss D: Patients Undergoing Total Disc Replacement with Spinal Fusion at Different Lumbar Levels. Spine Across the Sea. July, 2006; Maui, Hawaii.

225. Siddiqui S, Guyer R, Zigler J, Ohnmeiss D, Blumenthal S, Sachs B, Hochschuler S: Factors Related to the 20 Best and 20 Worst 24-months Outcomes of Total Disc Replacement in Prospective FDA-regulated Trials. Spine Across the Sea. July, 2006; Maui, Hawaii.

226. Guyer RD, Blumenthal SL, Geisler FH, McAfee PC, Regan JJ: The First Year Following FDA Approval of the CHARITÉ Artificial Disc: “Real World” Adverse Events Outside an IDE Study Environment. Spine Across the Sea. July, 2006; Maui, Hawaii.

227. Siddiqui S, Hochschuler SH, GuyerRD, Zigler JE, Ohnmeiss DD, Blumenthal SL, SachsBL, Rashbaum RF, Craig L:Factors Related to the 20 Best and 20 Worst 24-month Outcomes of Total Disc Replacement in Prospective FDA-regulated Trials. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

228. Blumenthal SL, Banco RJ, Bitan FD, Cappuccino A, Geisler FH, Guyer RD, Hochschuler SH, Holt RT, Jenis LG, Majd ME, McAfee PC, Mullin BB, Regan JJ, Stadlan NY, Tromanhauser SG, Wong DC: Lumbar Arthroplasty vs. Anterior Interbody Fusion at One-Level: Clinical Results at 5-Year Follow-up from the IDE Study of the CHARITÉ Artificial Disc. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

229. Blumenthal SL, Guyer RD, Geisler FH, McAfee PC, Regan JJ: The First Year Following FDA Approval of the CHARITÉ Artificial Disc: “Real World” Adverse Events Outside an IDE Study Environment. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

230. McAfee PC, Geisler FH, Saiedy S, Regan JJ, GuyerRD, Hochschuler SH, Cunningham BW: Revisions of Artificial Disc Replacement – Analysis of 688 Patients Enrolled in a US IDE Prospective Randomized Trial. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.
231. Geisler FH, Hochschuler SH, GuyerRD, McAfee PC, Regan JJ: Alternative Statistical Testing Demonstrates Superiority of Lumbar Arthroplasty Clinical Outcomes at 2 years vs. Fusion for the Treatment of One-Level Lumbar Degenerative Disc Disease at L4-5 or L5-S1. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

232. Guyer RD: Anterior Cervical Fusion. Simpósio Internacional de Coluna (SINCOL). August, 2006; Rio de Janeiro, Brazil.

233. Guyer RD: Dynamic Screw Fixation non-constrictive (Dynesys). Simpósio Internacional de Coluna (SINCOL). August, 2006; Rio de Janeiro, Brazil.

234. Guyer RD: Pseudoarthrosis (or Failed Back?) – Diagnostic and Treatment. Simpósio Internacional de Coluna (SINCOL). August, 2006; Rio de Janeiro, Brazil.

235. Guyer RD: News Perspectives on the treatment of Degenerative Disc Disease. Simpósio Internacional de Coluna (SINCOL). August, 2006; Rio de Janeiro, Brazil.

236. Guyer RD: Spine Arthroplasty – Economic Impact. Simpósio Internacional de Coluna (SINCOL). August, 2006; Rio de Janeiro, Brazil.

237. Guyer, RD, How to Capitalize on Idea Development from the Front Lines: Or from Napkin Drawings to Real World Agreements. Precourse: Your Innovative Idea: Technology Development Options. North American Spine Society. September, 2006; Seattle, Washington.

238. Siddiqui S, Guyer RD, Zigler JE, Ohnmeiss DD, Craig L, Blumenthal SL, Sachs BL, Hochschuler SH, Rashbaum RF. Factors Related to the 20 Best and 20 Worst 24 Month Outcomes of Total Disc Replacement in Prospective FDA-Regulated Trials. North American Spine Society. September, 2006; Seattle, Washington.

239. Guyer RD, Blumenthal SL, Geisler FH, McAfee PC. One-Level Lumbar Arthroplasty in Patients 18-45 Years of Age vs. Patients 46-60 Years of Age: Is There a Difference in Clinical Outcome? North American Spine Society. September, 2006; Seattle, Washington.

240. Blumenthal SL, Guyer RD, Geisler FH, McAfee PC, Regan JJ: The First Year Following FDA Approval of the CHARITÉ Artificial Disc: Real World Adverse Events Outside an IDE Study Environment. Spine Society of Europe (EuroSpine). October, 2006; Istanbul, Turkey.

241. Guyer RD: Defining Patient Selection: The Art of Avoiding Complications. Federation or Spine Associations. February, 2007; San Diego, California.

242. Guyer RD: Motion Preservation Technologies and Their Outcome (Instructional Course Lecture). American Academy of Orthopaedic Surgeons. February, 2007; San Diego, California.

243. Guyer RD: Lumbar Disc Replacement: Long-term Clinical and Radiological Results. Current Concepts in Emerging Technologies in Spine. February, 2007; Vail, Colorado.
244. Guyer RD: Lumbar Motion vs. Fusion. Current Concepts in Emerging Technologies in Spine. February, 2007; Vail, Colorado.

245. Guyer RD: How Disc Replacement Fits in the Treatment Algorithm for Degenerative Disc Disease: Refining Indications for Disc Replacement. Stryker Spine International Symposium. April, 2007; Lisbon, Portugal.

246. Guyer RD, McAfee PC, Banco RJ, Bitan FD, Cappuccino A, Geisler FH, Hochschuler SH, Holt RT, Jenis LG, Majd ME, Mullin BB, Regan JJ, Stadian NY, Tromanhauser SG, Wong DC, Blumenthal SL: Lumbar arthroplasty vs. anterior interbody fusion at one-level clinical results at 5-year follow-up from the IDE study of Charite artifical disc. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

247. Blumenthal SL, Geisler F, Zigler JE, Guyer RD, Ohnmeiss DD: Similarities and Differences in Clinical and Radiographic Outcomes of Two US IDE Trials for Lumbar Disc Replacement. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

248. Cunningham BW, DeMuth G, McAfee PC, Scott-Young M, Yoon K, Blumenthal S, Guyer R, Geisler F, Regan J, Conix JB, Hess R, Pimenta L, Diaz R, Fedder I, Tortolani PJ: Survivor analysis of the Charite artifical disc: Review of 1,938 patients from eight leading international spine centers. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

249. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ: The effect of previous surgery on clinical outcome following one-level lumbar arthroplasty. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

250. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ: Evidence for One-Level Lumbar Arthroplasty or Arthodesis for Degenerative Disc Disease: A Comparison of Two Lumbar Arthroplasty IDE Studies with 2-year Follow-Up. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

251. Blumenthal SB, Zigler JE, Guyer RD, Ohnmeiss DD: Comparison of Charite vs. ProDisc for the Treatment of Single-level Symptomatic Disc Degeneration: Prospective Data from One Center. International Society for the Study of the Lumbar Spine. June, 2007; Hong Kong, China.

252. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: A Prospective Randomized Study Comparing Two Lumbar Total Disc Replacement Devices. International Meeting on Advanced Spinal Techniques (IMAST). July, 2007; Paradise, Bahamas.

253. Cunningham BW, Demuth G, McAfee PC, Scott-Young M, Yoon, KJ, Blumenthal SL, Guyer RD, MD, Geisler F, Regan JJ, Conix B, Hes R, Pimenta L, Diaz R, Fedder RL, Tortolani J. Survivorship Analysis of the CHARITE Artificial Disc: Review of 1,938 Patients from Eight Leading International Spine Centers. International Meeting on Advanced Spinal Techniques (IMAST). July, 2007; Paradise, Bahamas.
254. McAfee PC, Cunningham BW, Geisler F, Guyer RD, Blumenthal SL, MD, Cappuccino A, Regan JJ: A Comparison of In Vivo and In Vitro Range of Motion Distribution Following One-Level Lumbar Arthroplasty —2 to 5 year Radiographic Follow up of 375 Consecutive Patients Enrolled in the CHARITÉ Artificial Disc FDA Level I Pivotal Trial. International Meeting on Advanced Spinal Techniques (IMAST). July, 2007; Paradise, Bahamas.

255. Guyer RD, Lhamby J, Ohnmeiss DD, Zigler J, Blumenthal S: Total Disc Replacement And Fusion At Different Lumbar Levels In The Same Patient. World Spine. July, 2007; Istanbul, Turkey.

256. Guyer RD: Myths of Spine Surgery. Neuroscience Lecture Series. August, 2007; Plano, Texas.

257. Blumenthal SL, Guyer RD, Ohnmeiss DD, Sachs BL, Hochschuler SH, Rashbaum RF: Comparison of ChariteVs. ProDisc for the Treatment of Single-level Symptomatic Disc Degeneration: Prospective Data from One Center. Spine Society of Europe. October, 2007; Brussels, Belgium.

258. Guyer RD, McAfee PC, Banco RJ, Bitan FD, Cappuccino A, Geisler FH, Hochschuler SH, Holt RT, Jenis LG, Majd ME, Mullin BB, Regan JJ, Stadian NY, Tromanhauser SG, Wong DC, Blumenthal SL: Lumbar arthroplasty vs. anterior interbody fusion at one-level clinical results at 5-year follow-up from the IDE study of Charite artificial disc. North American Spine Society. October, 2007; Austin, Texas.

259. Cunningham BW, Demuth G, McAfee PC, Scott-Young M, Yoon, KJ, Blumenthal SL, Guyer RD, MD, Geisler F, Regan JJ, Conix B, Hes R, Pimenta L, Diaz R, Fedder RL, Tortolani J. Survivorship Analysis of the CHARITE Artificial Disc: Review of 1,938 Patients from Eight Leading International Spine Centers. North American Spine Society. October, 2007; Austin, Texas.

260. Guyer RD: The Paradox in Medicine Today -Exciting Technology and Economic Challenges. (Presidential Address) North American Spine Society. October, 2007; Austin, Texas.

261. Blumenthal S, Roush T, Guyer R, Ohnmeiss D: Analysis of Hybrid (Total Disc Replacement / Fusion Constructs) in the LumbarSpine: A Comparison with Two-Level Total Disc Replacement. Asian Pacific Spine Arthroplasty Society. January, 2008; Seoul, South Korea.

262. Guyer R, Cappuccino A, Blumenthal S: A Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. Asian Pacific Spine Arthroplasty Society. January, 2008; Seoul, South Korea.

263. McAfee PC, Blumenthal SL, Guyer RD, Holt RT, Majd ME, Geisler FH, Banco RJ: Prospective, Randomized, Multicenter FDA IDE Study of Charité™ Artificial Disc vs. Lumbar Fusion: Effect at 5-Year Follow-up of Prior Surgery on Clinical Outcomes following Lumbar Arthroplasty. Congress of Neurological Surgeons/American Association of Neurological Surgeons. February, 2008; Orlando, Florida.
264. Guyer RD: Future of Healthcare in the US. Emerging Technologies Spine Education Summit. February, 2008; Jackson Hole, Wyoming.

265. Guyer RD: Charite Data. Current Concepts in Spinal Disorders. February, 2008; Las Vegas, Nevada.

266. Guyer RD: Kineflex. Current Concepts in Spinal Disorders. February, 2008; Las Vegas, Nevada.

267. Guyer RD: TDR Technology is Economically Feasible (Debate). Current Concepts in Spinal Disorders. February, 2008; Las Vegas, Nevada.

268. Guyer RD: Off-label Use of Innovative Medical Technology. Lumbar Spine Research Society. April, 2008; Chicago, Illinois.

269. Guyer RD, McAfee PC, Hochschuler SH, Holt RT, Majd ME, Blumenthal SL, Regan JJ, Geisler FH, Banco RJ, Jenis L, Wong D, Capuccino A, Tromanhauser SG, Bitan F, Stadlan N: Prospective, Randomized, Multicenter Food and Drug Administration Investigational Device Exemption Study of Lumbar Total Disc Replacement with the Charité™ Artificial Disc Versus Lumbar Fusion 5-Year Follow-up. Congress of Neurological Surgeons/American Association of Neurological Surgeons. February, 2008; Orlando, Florida.

270. Banco RJ, Geisler FH, Guyer RD, Hetzell B, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Age on Clinical outcomes following lumbar arthroplasty. Congress of Neurological Surgeons / American Association of Neurological Surgeons. February, 2008; Orlando, Florida.

271. Geisler FH, McAfee PC, Banco RJ, Blumenthal SL, Guyer RD, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Prior Surgery on Clinical outcomes following lumbar arthroplasty. Congress of Neurological Surgeons / American Association of Neurological Surgeons. February, 2008; Orlando, Florida.

272. Guyer RD: The Appropriate Process of Developing New Technology. (Symposium: Novel Technology for the Treatment of Spinal Disorders and the Effect on Orthopaedic Surgeons). American Academy of Orthopaedic Surgeons. March, 2008; San Francisco, California.

273. Guyer RD: Off-label Use of Innovative Medical Technology. Lumbar Spine Research Society. April, 2008; Chicago, Illinois.

274. Guyer, RD, Cappuccino A, Blumenthal SL: A Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. Spine Arthroplasty Society. May, 2008; Miami, Florida.
275. Banco RJ, Geisler FH, Guyer RD, Hetzell B, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Age on Clinical outcomes following lumbar arthroplasty. Spine Arthroplasty Society. May, 2008; Miami, Florida.

276. Geisler FH, Banco R, Blumenthal SL, Guyer RD, McAfee PC, Holt RT, Majd ME, Regan JJ: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar Fusion: Effect at 5-year Follow-up of Prior Discectomy on Clinical Outcomes Following Lumbar Arthroplasty. Spine Arthroplasty Society. May, 2008; Miami, Florida.

277. McAfee PC, Banco RJ, Blumenthal SL, Geisler FH, Guyer RD, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of Charite Artificial Disc Vs. Lumbar Fusion: Effect at 5-Year Follow-up of Prior Surgery on Clinical Outcomes Following Lumbar Arthroplasty. Eurospine. May, 2008; Geneva, Switzerland.

278. Guyer RD, Lauryssen C, Blumenthal SL: A Prospective Randomized Comparison of Cervical Total Disc Replacement to Anterior Cervical Fusion. North American Spine Society SpineWeek. May, 2008; Geneva, Switzerland.

279. Guyer RD, Cappuccino A, Blumenthal SL: A Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. North American Spine Society SpineWeek. May, 2008; Geneva, Switzerland.

280. Guyer RD: Kineflex. Innovative Techniques in Spine Surgery. June, 2008; Los Cabos, Mexico.

281. Guyer RD: Total Disc Replacement: One Clinic’s Experience with Almost 1,000 Patients in Eight Years (Key Note Lecture). South Africa Cineplex Congress Meeting. July, 2008; Cape Town, South Africa.

282. Guyer RD: Surgical Options for the Degenerative Cascade. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

283. Guyer RD: New Surgical Options for Spinal Stenosis. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

284. Guyer RD: Outcomes of Nearly 1000 Total Disc Replacements with 2-8 Year Follow up (Guest Lecture). Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

285. Guyer RD: Fusion versus Hybrid Total Disc Replacement for Degenerative Disc Disease. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

286. Li B, Guyer RD, Blumenthal SL, Zigler JE, Ohnmeiss DD:Does Pre-Operative Disc Height Affect Outcome of Lumbar Total Disc Replacement? International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

287. Guyer RD, Geisler FH, Holt RT, Majd ME, Regan JJ, Wong DC, Jenis LG, Banco RJ, Blumenthal SL, DeMuth GE, Hetzell BC: The Impact of Postoperative Disc Height following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year
Follow-up Study. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

288. Guyer RD, McAfee PC, Banco RJ, Bitan FD, Cappuccino A, Geisler FH, Hochschuler SH, Holt RT, Jenis LG, Majd ME, Regan JJ, Stadlan NY, Tromanhauser SG, Wong DC, Blumenthal SL: Prospective, Randomized, Multicenter, Food and Drug Administration Investigational Device Exemption Study of Lumbar Total Disc Replacement with the Charite Artificial Disc Versus Lumbar Fusion – 5 Year Follow-up. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

289. Banco RJ, Geisler FH, Guyer RD, Hetzell B, Holt RT, Majd, ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Age on Clinical outcomes following lumbar arthroplasty. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

290. McAfee PC, Banco RJ, Blumenthal SL, Geisler FH, Guyer RD, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Prior Surgery on Clinical outcomes following lumbar arthroplasty. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

291. Geisler FH, Banco RJ, Blumenthal SL, Guyer RD, McAfee PC, Holt RT, Majd ME, Regan JJ: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Prior Discectomy on Clinical outcomes following lumbar arthroplasty. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

292. Blumenthal SL, Ohnmeiss DD, Guyer RD, Hochschuler SH: Analysis of Total Disc Replacement Outcomes When Applying MCID (Minimal Clinically Important Difference) Criteria. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

293. Majd ME, Holt RT, Guyer RD, Banco RJ, Geisler FH, Jenis LG, Regan JJ, Wong DC, Blumenthal SL: Two- and Five-year lumbar index-level motion following Arthroplasty: Impact of heterotopic ossification. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

294. Guyer RD: Total Disc Replacement: One Clinic’s Experience with Almost 1,000 Patients in Eight Years (Key Note Lecture). South Africa Cineplex Congress Meeting. July, 2008; Cape Town, South Africa.

295. Guyer RD: Surgical Options for the Degenerative Cascade. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

296. Guyer RD: New Surgical Options for Spinal Stenosis. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.
297. Guyer RD: Outcomes of Nearly 1000 Total Disc Replacements with 2-8 Year Follow up (Guest Lecture). Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

298. Guyer RD: Fusion versus Hybrid Total Disc Replacement for Degenerative Disc Disease. Simposio Internacional de Coluna. July, 2008; Rio de Janeiro, Brazil.

299. Guyer RD: Myths of Spine Surgery. Neuroscience Lecture Series. August, 2008; Plano, Texas.

300. Guyer RD: Lumbar ADR: State of the Art. (Pre-course). North American Spine Society. October, 2008; Toronto, Canada.

301. Guyer RD, Cappucino A, Blumenthal S: A Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. North American Spine Society. October, 2008; Toronto, Canada.

302. Guyer RD, Geisler F, Majd M, Holt RT, Regan J, Blumenthal S, Wong D, Jenis L, Banco R: The Impact of Preoperative DEXA Scores Following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year Follow-up Study. North American Spine Society. October, 2008; Toronto, Canada.

303. Guyer RD: Indications of Semi-rigid Fixation. Brussels International Spine Symposium. November, 2008; Brussels, Belgium.

304. Guyer RD: Overview of Existing Pedicle Based Dynamic Systems. Brussels International Spine Symposium. November, 2008; Brussels, Belgium.

305. Guyer RD : Outcomes of Nearly 1000 Total Disc Replacements with 2-8 Year Follow-up. Capital Scientific Summit. October, 2008 ; Beijing, China.

306. Guyer RD: Total Disc Replacement – Pro (Debate – part of symposium). American Academy of Orthopaedic Surgeons. February, 2009; San Francisco, California.

307. Guyer RD: Considerations in Physician-Owned Companies: Divesting or Disclosure? Emerging Technologies Spine Education Summit. February, 2009; Steamboat Springs,Colorado.

308. Guyer RD: Lumbar TDR: Indications – Patient Selection – Contra-Indications. Current Concepts in Spinal Disorders. February, 2009; Las Vegas, Nevada.

309. Guyer RD: Is There A Role for Hybrid Constructs? Current Concepts in Spinal Disorders. February, 2009; Las Vegas, Nevada.

310. Guyer RD: Can Society Afford TDR? (Symposium: Challenges and Complications). Spine Arthroplasty Society. April-May, 2009; London, England.

311. Zigler JE, Parkinson A, Guyer RD, Blumenthal SL, Ohnmeiss DD: Re-operations in Lumbar Total Disc Replacement: Experience with Our First Consecutive 800 Cases. Spine Arthroplasty Society. April-May, 2009; London, England.
312. Guyer RD, Shellock J, MacLennan B, Hanscom D, Knight RQ, McComb P, Jacobs J, Bradford D: Early Failure of Metal-on-Metal Artificial Discs Due to Metal Hypersensitivity: The Diagnostic and Treatment Approach in 4 Collected Cases. Spine Arthroplasty Society. April-May, 2009; London, England.

313. Ohnmeiss DD, Guyer RD, Blumenthal SL, Zigler JE: Impact of Adverse Events on Outcome in Cervical Total Disc Replacement Trials. Spine Arthroplasty Society. April-May, 2009; London, England.

314. Guyer RD, Cappuccino A, Blumenthal SL: 24-month Follow-up of a Prospective Randomized Comparison of Two Lumbar Total Disc Replacements. Spine Arthroplasty Society. April-May, 2009; London, England.

315. Wong DC, Jenis LG, Guyer RD, Banco RJ, Geisler FH, Holt RT, Majd ME, Regan JJ, Blumenthal SL, DeMuth GE, Hetzell BC: Is Preoperative Disc Height a Contributing Factor in 5-year Success Rate with Arthrodesis and Arthroplasty? Spine Arthroplasty Society. April-May, 2009; London, England.

POSTERS

1. Sachs BL, Vanharanta H, Rashbaum RF, Guyer RD, Hochschuler SH, Ohnmeiss DD, Schwartz P, Gilbert PJ: Objective Signs of Lumbar Radicular Syndrome in Conservative Treatment. International Society for the Study of the Lumbar Spine. June, 1986; Dallas, Texas.

2. Hochschuler SH, Guyer RD, Rashbaum RF: Proplast Reconstruction of the Iliac Crest for Anterior Lumbar Interbody Fusions and Anterior Cervical Fusions. International Society for the Study of Lumbar Spine. June, 1986; Dallas, Texas.

3. Vanharanta H, Sachs BL, Spivey M, Guyer RD, Rashbaum RF, Hochschuler SH, Ohnmeiss DD: Comparison of Disc Narrowing with Discographic Degenerative Changes and Pain Provocation. International Society for the Study of the Lumbar Spine. May, 1987; Rome, Italy.

4. Sachs BL, Vanharanta H, Rashbaum RF, Guyer RD, Hochschuler SH, Ohnmeiss DD, Schwartz P, Gilbert PJ: Comparison of Effect of Epidural Steroids and Physical Therapy on Root Tension Signs in Lumbar Radicular Syndrome. North American Spine Society. June, 1987; Banff, Canada.

5. Vanharanta H, Mooney V, Jarvis GL, Hochschuler SH, Guyer RD, Johnson RG, Gilbert PJ, Ritz S, Ohnmeiss DD, Stith WJ: Effect of Repeated Trunk Extension and Flexion Movements on CT/Discogram. North American Spine Society. June, 1987; Banff, Canada.
6. Hochschuler SH, Rashbaum RF, Guyer RD, Stith WJ, Ohnmeiss DD: Proplast Reconstruction of Iliac Crest Defects. North American Spine Society. June, 1987; Banff, Canada.

7. Vanharanta H, Sachs BL, Spivey M, Guyer RD, Rashbaum RF, Hochschuler SH, Ohnmeiss DD: Comparison of Disc Narrowing with Discographic Degenerative Change and Pain Provocation. American Academy of Orthopaedic Surgeons. February, 1988; Atlanta, Georgia.

8. Vanharanta H, Sachs BL, Aprill C, Spivey M, Ohnmeiss DD, Rashbaum RF, Hochschuler SH, Guyer RD, Videman T, Terry A, Selby D, Stith WJ, Mooney V: Disc Deterioration in Low Back Syndromes: A Prospective Multi-center CT/Discography Study. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

9. Ohnmeiss DD, Stith WJ, Guyer RD, Rashbaum RF, Hochschuler SH, Loguidice VA, Lonstein M: Comparison of Results of Lumbar Anterior Interbody Fusion, Posterior Fusion, Instrumentation and 360o Fusion Performed by the Same Group of Surgeons. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

10. Shea D, Stith WJ, Ohnmeiss DD, Hochschuler SH, Guyer RD, Rashbaum RF: The Effect of Sensory Deprivation on the Reduction of Pain in Chronic Low Back Patients. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

11. Vanharanta H, Ohnmeiss DD, Stith WJ, Hochschuler SH, Guyer RD, Mooney V: Effect of Repeated Trunk Extension and Flexion Movements As Seen By CT/Discography. International Society for the Study of the Lumbar Spine. April, 1988; Bal Harbour, Florida.

12. Vanharanta H, Sachs BL, Aprill C, Spivey M, Ohnmeiss DD, Rashbaum RF, Hochschuler SH, Guyer RD, Videman T, Stith WJ, Mooney V: CT/Discography and Pain Response in Different Age Groups. North American Spine Society. July, 1988; Colorado Springs, Colorado.

13. Guyer RD, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Loguidice VA, Lonstein M: Comparison of Results of Lumbar Anterior Interbody Fusion, Posterior Fusion, Instrumentation and 360o Fusion Performed by the Same Group of Surgeons. North American Spine Society. July, 1988; Colorado Springs, Colorado.

14. Guyer RD, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Lonstein M, Regan JJ: An Analysis of the Effects of Repeat Discography. North American Spine Society. July, 1988; Colorado Springs, Colorado.

15. Ohnmeiss DD, Vanharanta H, Stith WJ, Carranza CB, Guyer RD, Rashbaum RF, Hochschuler SH: Radiographic Muscle Density and Increased Function Following an Active Rehabilitation Program. International Society for the Study of the Lumbar Spine. May, Guyer RD, Vanharanta H, Ohnmeiss DD, Stith WJ, Sachs BL, Hochschuler SH, Rashbaum RF: Validity of Myelographic and CT/Discographic Images in Identifying Clinically Painful Disc Lesions. North American Spine Society. June, 1989; Quebec City, Canada.

16. Lonstein ML, Guyer RD, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF: Posterior Lumbar Fusion and Instrumentation. North American Spine Society. June, 1989; Quebec City, Canada.

17. Vanharanta H, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Rashbaum RF, Sachs BL: The Effect of Lumbar Level in Painful Disc Deterioration. North American Spine Society. June, 1989; Quebec City, Canada.

18. Ohnmeiss DD, Vanharanta H, Stith WJ, Carranza CB, Guyer RD, Rashbaum RF, Hochschuler SH: Radiographic Muscle Density and Increased Function Following an Active Rehabilitation Program. North American Spine Society. June, 1989; Quebec City, Canada.

19. Vanharanta H, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Rashbaum RF, Sachs BL: Sensitivity and Specificity of CT/Discography. North American Spine Society. June, 1989; Quebec City, Canada.

20. Shea DD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Guyer RD, Hochschuler SH: The Effects of Sensory Deprivation on Muscle Activity and Pain Reduction in Chronic Low Back Pain Patients. North American Spine Society. June, 1989; Quebec City, Canada.

21. Guyer RD, Hochschuler SH, Ohnmeiss DD, Rashbaum RF, Regan JJ, Stith WJ: Initial Results and Complications of Pedicle Screw Fixation. Scoliosis Research Society/North American Spine Society joint conference on Advanced Pedicle Fixation of the Lumbar Spine. March, 1990; Dallas, Texas

22. Guyer RD, Vanharanta H, Ohnmeiss DD, Stith WJ, Sachs BL, Hochschuler SH, Rashbaum RF: Validity of Myelographic and CT/Discographic Images in Identifying Clinically Painful Disc Lesions. International Association for the Study of Pain. April, 1990; Australia.

23. Guyer RD, Vanharanta H, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Regan JJ: The Relationship Between Pain Drawings and CT/Discographic Findings. International Society for the Study of the Lumbar Spine. May, 1990; Boston, Massachusetts.

24. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. International Society for the Study of the Lumbar Spine. June, 1990; Boston, Massachusetts.

25. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: Anterior Lumbar Interbody Fusion with Composite Bone-Bank Bone. International Society for the Study of the Lumbar Spine. June, 1990; Boston, Massachusetts.
27. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: Anterior Lumbar Interbody Fusion Using Donor Femur Bone Grafts. North American Spine Society. August, 1990; Monterey, California.

28. Hochschuler SH, Guyer RD, Ohnmeiss DD, Glisan B, Sheets C, Evans D, Stith WJ, Rashbaum RF, Regan JJ: The Effects of Wearing an Abdominal Support Belt on the Amount of Weight Lifted by Low Back Pain Patients. North American Spine Society. August, 1990; Monterey, California.

29. Guyer RD, Hochschuler SH, Ohnmeiss DD, Rashbaum RF, Regan JJ, Stith WJ: Initial Results and Complications of Pedicle Screw Fixation. North American Spine Society. August, 1990; Monterey, California.

30. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. North American Spine Society. August, 1990; Monterey, California.

31. Vanharanta H, Guyer RD, Ohnmeiss DD, Hochschuler SH, Rashbaum RF, Stith WJ: The Number of Painful and Degenerated Lumbar Discs Levels in Low Back Pain Patients. North American Spine Society. August, 1990; Monterey, California.

32. Guyer RD, Vanharanta H, Ohnmeiss DD, Stith WJ, Hochschuler SH, Rashbaum RF, Regan JJ: The Relationship Between Pain Drawings and CT/Discographic Findings. North American Spine Society. August, 1990; Monterey, California.

33. Guyer RD, Hochschuler SH, Ohnmeiss DD, Rashbaum RF, Regan JJ, Stith WJ: Initial Results and Complications Associated with the Wiltse Pedicle Screw Fixation System. American Academy of Orthopaedic Surgeons. March, 1991; Anaheim, California.

34. Guyer RD, Ohnmeiss DD, Hochschuler SH, Stith WJ, Rashbaum RF, Regan JJ: The Use of CT/Discography to Identify Recurrent Disc Herniation Not Visualized by Gadolinium Enhanced MRI. American Academy of Orthopaedic Surgeons. March, 1991; Anaheim, California.

35. Hochschuler SH, Guyer RD, Castleman C, Ohnmeiss DD, Stith WJ, Spivey MA, Rashbaum RF, Regan JJ: Cine MRI to Visualize Functional Pathology in the Spine. American Academy of Orthopaedic Surgeons. March, 1991; Anaheim, California.

36. Hochschuler SH, Guyer RD, Ohnmeiss DD, Rashbaum RF, Regan JJ: Single-level Stabilization with Femur Grafts. International Society for the Study of the Lumbar Spine. May, 1991; Heidelberg, Germany.

37. Hochschuler SH, Guyer RD, Castleman C, Ohnmeiss DD, Stith WJ, Spivey MA, Rashbaum RF, Regan JJ: Cine MRI to Visualize Functional Pathology in the Spine. International Society for the Study of the Lumbar Spine. May, 1991; Heidelberg, Germany.

38. Rashbaum RF, Ohnmeiss DD, Stith WJ, Bogdanffy GM, Guyer RD, Hochschuler SH, Regan JJ: Initial Results of Spinal Cord Stimulation in Chronic Pain Patients. International Society for the Study of the Lumbar Spine. May, 1991; Heidelberg, Germany.
39. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: Comparison of Single Level Arthroscopic Microdiscectomy to Laminectomy and Discectomy. North American Spine Society. August, 1991; Keystone, Colorado.

40. Hochschuler SH, Guyer RD, Ohnmeiss DD, Rashbaum RF, Regan JJ: Single-level Stabilization with Femur Grafts. North American Spine Society. August, 1991; Keystone, Colorado.

41. Rashbaum RF, Ohnmeiss DD, Stith WJ, Guyer RD, Hochschuler SH, Regan JJ: Initial Results of Spinal Cord Stimulation in Chronic Pain Patients. North American Spine Society. August, 1991; Keystone, Colorado.

42. Guyer RD, Hochschuler SH, Ohnmeiss DD, Stith WJ, Spivey MA, Castleman C, Rashbaum RF, Regan JJ: Cine MRI to Visualize Functional Pathology in the Spine. North American Spine Society. August, 1991; Keystone, Colorado.

43. Guyer RD, Ohnmeiss DD, Stith WJ, Bonnick SL, Hochschuler SH, Rashbaum RF, Regan JJ: Changes in Vertebral Bone Density Following Lumbar Spine Fusion and Post-operative Bracing. North American Spine Society. August, 1991; Keystone, Colorado.

44. Guyer RD, Hochschuler SH, Ohnmeiss DD, Stith WJ, Spivey MA, Castleman C, Rashbaum RF, Regan JJ: Dynamic MRI: A New Technique to Identify Functional Pathology in the Spine. Cervical Spine Research Society. December, 1991; Philadelphia, Pennsylvania.

45. Hochschuler SH, Guyer RD, Ohnmeiss DD, Stith WJ, Rashbaum RF, Regan JJ: Comparison of Single Level Arthroscopic Microdiscectomy to Laminectomy and Discectomy. American Academy of Orthopaedic Surgeons. February, 1992; Washington, D.C.

46. Regan JJ, Shelokov AP, Guyer RD, Hochschuler SH, Rashbaumn RF: Correction of Lumbar Scoliosis in Adults Using the Texas Scottish Rite Hospital System Anteriorly. International Society for the Study of the Lumbar Spine. May, 1992; Chicago, Illinois.

47. Floyd T, Hochschuler SH, Vanharanta H, Ohnmeiss DD, Guyer RD: The Relationship of Facet Tropism to Degenerative Disc Disease. International Society for the Study of the Lumbar Spine. May, 1992; Chicago, Illinois.

48. Bogdanffy GM, Ohnmeiss DD, Guyer RD, Griffith SL: Bone Mineral Density Above a Multi-Segmental Lumbar Spinal Fusion. American Society for Bone and Mineral Research. September, 1992; Minneapolis, Minnesota.

49. Guyer RD, Hochschuler SH, Bogdanffy GM, Ohnmeiss DD: Early Changes in Pain and Physical Function Following Lumbar Spinal Fusion. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France.

50. Perim DM, Guyer RD, Elliott FT, Ohnmeiss DD, Alfano S: Lumbar Laminectomy-Discectomy: Factors Associated with Increased Cost and Extended Treatment. International Society for the Study of the Lumbar Spine. June, 1993; Marseilles, France. Yrjämä M, Vanharanta H, Ohnmeiss DD, Hochschuler SH, Guyer RD: Vibration of the Spinous Process Provokes Pain Similar to That Produced by Discography. North American Spine Society. October, 1993; San Diego, California.

51. Ohnmeiss DD, Vanharanta H, Guyer RD, Hochschuler SH: The Association Between Pain Drawings and Discordant Discographic Pain Reports. North American Spine Society. October, 1993; San Diego, California.

52. Ohnmeiss DD, Vanharanta H, Guyer RD, Hochschuler SH: The Relationship Between Pain Location and Disc Pathology: A Study of Pain Drawings and CT/Discography. North American Spine Society. October, 1993; San Diego, California.

53. Block AR, Vanharanta H, Ohnmeiss DD, Guyer RD, Hochschuler SH: Discordant CT/Discography Results: Psychological Factors Play a Role. North American Spine Society. October, 1993; San Diego, California.

54. Bogdanffy GM, Ohnmeiss DD, Griffith SL, Guyer RD: Non-Radiological Screening of Bone Quality for Spinal Fusion Candidates. North American Spine Society. October, 1993; San Diego, California.

55. Weinhoffer SL, Guyer RD, Herbert M, Griffith SL, Ohnmeiss DD: In-Vitro Intradiscal Pressure Measurements above a Simulated Instrumented Fusion. American Academy of Orthopaedic Surgeons. February, 1994; New Orleans, Louisiana.

56. Bogdanffy GM, Ohnmeiss DD, Guyer RD: Early Changes in Bone Mineral Density above a Combined Anterior-Posterior L4-S1 Lumbar Spinal Fusion In-Vivo. Orthopaedic Research Society. February, 1994; New Orleans, Louisiana.

57. Ohnmeiss DD, Hochschuler SH, Guyer RD: Patient Selection Criteria for Laser Disc Decompression. International Society for the Study of the Lumbar Spine. June, 1994; Seattle, Washington.

58. Weinhoffer SL, Guyer RD, Griffith SL: In Vitro Intradiscal Pressure Measurements Above a Simulated Instrumented Fusion. International Society for the Study of the Lumbar Spine. June, 1994; Seattle, Washington.

59. Vanharanta H, Ohnmeiss DD, Guyer RD: The Value of Post-Discographic Lidocaine Injection. North American Spine Society; October, 1994; Minneapolis, Minnesota.

60. Block AR, Vanharanta H, Ohnmeiss DD, Guyer RD, Hochschuler SH: Discordant CT/Discography Results: Psychological Factors Play a Role. American Pain Society. November, 1994; Orlando, Florida.

61. Vanharanta H, Ohnmeiss DD, Guyer RD: Are Lumbar Flexion-Extension Films Useful in Identifying Discogenic Pain? American Academy of Orthopaedic Surgeons. February, 1995; Orlando, Florida.

62. Bogdanffy GM, Ohnmeiss DD, Guyer RD: The Relationship between Isometric Leg Function and Pain Distribution. American College of Sports Medicine. June, 1995; Minneapolis, Minnesota.
64. Bogdanffy GM, Kime C, Guyer RD: Percutaneous Lumbar Discectomy: A Comparison of Two Nuclear Aspiration Systems In Vitro. North American Spine Society. October, 1995; Washington, D.C.

65. Mason SL, Shelokov AP, Guyer RD, Ohnmeiss DD: Complications of Cervical Discography: Findings in a Large Series. Cervical Spine Research Society. November-December, 1995; Sante Fe, New Mexico.

66. Guyer RD, Wealtz M: The Effect of Posterior Instrumentation on In Vitro Cervical Intradiscal Pressure. Cervical Spine Research Society. November-December, 1995; Sante Fe, New Mexico.

67. Mason SL, Shelokov AP, Guyer RD, Ohnmeiss DD: Complications of Cervical Discography: Findings in a Large Series. American Academy of Orthopaedic Surgeons. February, 1996; Atlanta, Georgia.

68. Guyer RD, Ohnmeiss DD, Vanharanta H, Mason SL: Are Results of Lumbar and Cervical Discography Similar? International Society for the Study of the Lumbar Spine. June, 1996; Burlington, Vermont.

69. Gronblad M, Vanharanta H, Virri J, Rashbaum R, Guyer R, Rytomaa T, Karaharju EO: Cellular and Molecular Mechanisms in Degenerated Intervertebral Disc: An Immunohistochemical Study. International Society for the Study of the Lumbar Spine. June, 1996; Burlington, Vermont.

70. Block AR, Ware D, Ohnmeiss DD, Guyer RD: Initial Results from a Psycho-Social Screening Package for Spine Surgery Candidates. International Association for the Study of Pain. August, 1996; Vancouver, Canada.

71. Block AR, Ware D, Ohnmeiss DD, Guyer RD: Initial Results from a Psycho-Social Screening Package for Spine Surgery Candidates. North American Spine Society. October, 1996; Vancouver, Canada.

72. Araghi A, Guyer RD, Fulp RT, Ohnmeiss DD, Blumenthal SL, Hochschuler SH, Regan JJ, Shelokov AP, Rashbaum RF: Use of Morphine Paste for Pain Control in Lumbar Laminectomies. Spine + Science + Management; November, 1996; New Orleans, Louisiana.

73. Cartwright TJ, Guyer RD, Ohnmeiss DD, Fulp RT, Mason SL: Results of Anterior Fusion for Equivocal Pathology Clarified by Discography. Spine + Science + Management; November, 1996; New Orleans, Louisiana.

74. Guyer RD, Ohnmeiss DD, Vanharanta H, Mason SL: Are Results of Lumbar and Cervical Discography Similar? American Academy of Orthopaedic Surgeons. February, 1997; San Francisco, California.

75. Regan JJ, Mack M, Aronoff RJ, Guyer, RD, Blumenthal, SL, Ahrens JE, Ohnmeiss DD: Development of Video-Assisted Thoracoscopic Spine Surgery. (Scientific Exhibit) American Academy of Orthopaedic Surgeons. February, 1997; San Francisco, California.
76. Cartwright TJ, Guyer RD, Ohnmeiss DD, Fulp RT, Mason SL: Results of Anterior Fusion for Equivocal Pathology Clarified by Discography. Spine Across the Sea. March, 1997; Hawaii.

77. Araghi A, Guyer RD, Fulp RT, Ohnmeiss DD, Blumenthal SL, Hochschuler SH, Regan JJ, Shelokov AP, Zigler JE, Rashbaum RF: Use of Morphine Paste for Pain Control in Lumbar Laminectomies. International Society for the Study of the Lumbar Spine. June, 1997; Singapore.

78. Massoud B, Ohnmeiss DD, Rinn C, Guyer RD, Hochschuler SH, Rashbaum RF, Blumenthal SL, Zigler JE, Regan JJ, Fulp T: Results of Hardware Removal in the Lumbar Spine and the Role of Diagnostic Hardware Injection. Spine + Science + Management; November, 1997; New Orleans, Louisiana.

79. Hyde J, Ohnmeiss DD, Rinn C, Guyer RD, Rashbaum RF, Blumenthal SL, Zigler JE, Regan JJ, Fulp T: Anterior Cervical Fusion: Factors Related to Outcome. Spine + Science + Management; November, 1997; New Orleans, Louisiana.

80. Guyer RD: Inhibition of Postoperative Peridural Fibrosis with a Bioresorbable Carbohydrate Gel: ADCON-L. (Scientific Exhibit) American Academy of Orthopaedic Surgeons. March, 1998; New Orleans, Louisiana.

81. Massoud B, Ohnmeiss DD, Rinn C, Guyer RD, Hochschuler SH, Rashbaum RF, Blumenthal SL, Zigler JE, Regan JJ, Fulp T: Results of Hardware Removal in the Lumbar Spine and the Role of Diagnostic Hardware Injection. North American Spine Society. October, 1998; San Francisco, California.

82. Sengupta D, Ohnmeiss DD, Hyde J, Zigler JE, Regan JJ, Hochschuler SH, Fulp T, Guyer RD: Intrasegmental Repair of Pars Defect – Early Results Using a Simple Technique. International Society for the Study of the Lumbar Spine. June, 1999; Kona, Hawaii.

83. Blumenthal SL, Simpson NS, Ohnmeiss DD, Risk DE Boehler S, Guyer RD, Zigler JE, Fulp T, Hochschuler SH: Anterior Lumbar Interbody Fusion with Threaded Fusion Cages. International Society for the Study of the Lumbar Spine. June, 1999; Kona, Hawaii.

84. Sengupta D, Ohnmeiss DD, Guyer RD, Hochschuler SH: Biomechanical Evaluation of Immediate Stability with Rectangular vs. Cylindrical Interbody Fusion Cages in Stabilization of the Lumbar Spine. International Society for the Study of the Lumbar Spine. June, 1999; Kona, Hawaii.

85. Block AR, Guyer RD, Ohnmeiss DD: Use of Presurgical Psychosocial Screening to Predict Spine Surgery Outcome. International Association for the Study of Pain. August, 1999; Vienna, Austria.

86. Ohnmeiss DD, Blumenthal SL, Guyer RD, Zigler JE, Hochschuler SH: Analysis of Threaded Fusion Cage Subsidence. North American Spine Society. October, 1999; Chicago, Illinois.
87. Blumenthal SL, Regan JJ, Hisey MS, Ohnmeiss DD, Guyer RD, Hochschuler SH, Zigler JE: Can Threaded Fusion Cages Be Used Effectively As Stand-Alone Devices? North American Spine Society. October, 1999; Chicago, Illinois.

88. Sengupta D, Ohnmeiss DD, Guyer RD, Hochschuler SH: Biomechanical Evaluation of Immediate Stability with Rectangular vs. Cylindrical Interbody Fusion Cages in Stabilization of the Lumbar Spine. North American Spine Society. October, 1999; Chicago, Illinois.

89. Blumenthal SL, Hisey MS, Ohnmeiss DD, Regan JJ, Guyer RD, Hochschuler SH, Zigler JE: Can Threaded Fusion Cages Be Used Effectively as Stand-Alone Devices? International Society for the Study of the Lumbar Spine. April, 2000; Adelaide, Australia.

90. Ohnmeiss DD, Blumenthal SL, Guyer RD, Hochschuler SH, Zigler JE: Can Foraminal Height be Increased and Maintained with Anterior Lumbar Interbody Fusion Using Cages? International Society for the Study of the Lumbar Spine. April, 2000; Adelaide, Australia.

91. Ohnmeiss DD, Blumenthal SL, Guyer RD, Zigler JE, Hochschuler SH: Analysis of Threaded Fusion Cage Subsidence. International Society for the Study of the Lumbar Spine. April, 2000; Adelaide, Australia.

92. Ohnmeiss DD, Blumenthal SL, Guyer RD, Hochschuler SH, Zigler JE: Can Foraminal Height be Increased and Maintained with Anterior Lumbar Interbody Fusion Using Cages? Spine Across the Sea. July, 2000; Kona, Hawaii.

93. Blumenthal SL, Hisey MS, Ohnmeiss DD, Regan JJ, Guyer RD, Hochschuler SH, Zigler JE: Can Threaded Fusion Cages Be Used Effectively as Stand-Alone Devices? Spine Across the Sea. July, 2000; Kona, Hawaii.

94. Sengupta D, Ohnmeiss DD, Hyde J, Zigler JE, Regan JJ, Hochschuler SH, Fulp T, Guyer RD: Intrasegmental Repair of Pars Defect –Results Using a Simple Technique. Spine Across the Sea. July, 2000; Kona, Hawaii.

95. Ohnmeiss DD, Blumenthal SL, Guyer RD, Zigler JE, Hochschuler SH: Analysis of Threaded Fusion Cage Subsidence. Spine Across the Sea. July, 2000; Kona, Hawaii.

96. Burton DC, Ohnmeiss DD, Blumenthal SL, Rashbaum RF, Zigler JE, Guyer RD, Regan JJ: Anterior Cervical Discectomy and Fusion with Allograft Bone and Plate Fixation. North American Spine Society. October, 2000; New Orleans, Louisiana.

97. Regan JJ, Ohnmeiss DD, Hochschuler SH, Blumenthal SL, Guyer RD: Comparison of Laparoscopic to Mini-open Fusion at the L4-5 Level. International Society for the Study of the Lumbar Spine. June, 2001; Edinburgh, Scotland.

98. Guyer RD, McAfee PC, Hochschuler SH, Blumenthal SL, Fedder I, Ohnmeiss DD: Prospective Evaluation of the SB Charité III Disc Prosthesis. North American Spine Society. November, 2001; Seattle, Washington.
99. Tran V, Ohnmeiss DD, Blumenthal SL, Chang Y, Guyer RD, Zigler JE, Hochschuler SH, Hisey MS: Analysis of Re-Operations When Using Cages as Stand-Alone Devices: Minimum Three Year Follow-Up Study. Spine + Science + Management; November, 2001; New Orleans, Louisiana.

100. Henry S, Ohnmeiss DD, Guyer RD, Zigler JE, Chang Y, Rashbaum RF, Blumenthal SL: Outcome of Anterior Cervical Fusion for Discographically Proven Pain. Spine + Science + Management. November, 2001; New Orleans, Louisiana.

101. Ferrara LA, Zigler JE, Guyer RD: In Vitro Evaluation of Facet Motion Following Anterior Interbody Fusion. Congress of Neurological Surgeons. 2001; San Diego, California.

102. Tran V, Ohnmeiss DD, Blumenthal SL, Chang Y, Guyer RD, Zigler JE, Hochschuler SH, Hisey MS, Rashbaum RF: Analysis of Re-Operations When Using Cages as Stand-Alone Devices: Minimum Three Year Follow-Up Study. Meeting of the Americas. April, 2002; New York, New York.

103. Henry S, Ohnmeiss DD, Guyer RD, Zigler JE, Chang Y, Rashbaum RF, Blumenthal SL: Outcome of Anterior Cervical Fusion For Discographically Proven Pain. American Spinal Injury Association and the IMSOP joint conference. May, 2002; Vancouver, Canada.

104. Tran V, Ohnmeiss DD, Blumenthal SL, Chang Y, Guyer RD, Zigler JE, Hochschuler SH, Hisey MS, Rashbaum RF: Analysis of Re-Operations When Using Cages as Stand-Alone Devices: Minimum Three Year Follow-Up Study. American Spinal Injury Association and the IMSOP joint conference. May, 2002; Vancouver, Canada.

105. Henry S, Ohnmeiss DD, Guyer RD, Zigler JE, Chang Y, Rashbaum RF, Blumenthal SL: Outcome of Anterior Cervical Fusion For Discographically Proven Pain. American Academy of Orthopaedic Surgeons. February, 2003; New Orleans, Louisiana.

106. Zigler JE, Chang Y, Ohnmeiss DD, Guyer RD: Open-Door Laminoplasty in the Treatment of Cervical Myelopathy. American Spinal Injury Association. April, 2003; Miami, Florida.

107. Ohnmeiss DD, Hochschuler SH, Guyer RD, Rashbaum RF, Blumenthal SL: Sleep Disturbances in Back Pain Patients. International Society for the Study of the Lumbar Spine. May, 2003; Vancouver, Canada.

108. Blumenthal SL, Guyer RD, Hochschuler SH, Ohnmeiss DD: Prospective Outcome Evaluation of a Total Disc Replacement. International Society for the Study of the Lumbar Spine. May, 2003; Vancouver, Canada.

109. Zigler JE, Guyer RD, Chang Y, Ohnmeiss DD: Open-Door Laminoplasty in the Treatment of Cervical Myelopathy. World Spine. August 2003; Chicago, Illinois.

110. Guyer RD, Henry S, Ohnmeiss DD, Zigler JE, Chang Y, Rashbaum RF, Blumenthal SL: Outcome of Anterior Cervical Fusion for Cervical Discogenic Pain with Confirmatory Discography. Cervical Spine Research Society. December, 2003; Scottsdale, Arizona. Hochschuler SH, Whitaker C, Zigler JE, Guyer RD, Sachs BL, Blumenthal SL, Rashbaum RF, Ohnmeiss DD: Comparison of Return to Work Following Total Disc Arthroplasty vs. Fusion: A Prospective, Randomized Study. Spinal Arthroplasty Society. May, 2004; Vienna, Austria.

111. Gottlieb J, Sachs B, Guyer R, Zigler J, Rashbaum R, Hochschuler S, Blumenthal S, Ohnmeiss D: Comparison of Complications Associated with Lumbar Artificial Disc Replacement Versus Fusion at 2 Year Follow-up. International Society for the Study of the Lumbar Spine. June, 2004; Porto, Portugal.

112. Blumenthal S, McAfee P, Guyer R, Hochschuler S, Garcia R, Regan J, Ohnmeiss D: Randomized Controlled Trial of the Charité Artificial Disc vs. Fusion for Single-Level Degenerative Disc Disease: A Two-Year Follow-up Study. International Society for the Study of the Lumbar Spine. June, 2004; Porto, Portugal.

113. Guyer R, Zigler JE, Hochschuler S, Rashbaum RF, Hisey M: A Prospective Study Through an Investigational Device Exemption (IDE) Comparing a New Modular Cage with the BAK Cylindrical Cage for Anterior Lumbar Interbody Fusion: 49 Consecutively Operative Cases. International Meeting on Advanced Spinal Techniques (IMAST). July, 2004; Bermuda.

114. Regan J, McAfee PC, Guyer RD, Blumenthal S, Geisler F: Charite Artificial Disc Replacement Evaluaiton of the Learning Curve and Complicaitons I a Multicenter Prospective Randomized Controlled FDA IDE Trial. North American Spine Society. October, 2004; Chicago, Illinois.

115. Ohnmeiss DD, Guyer RD: 24 Month Follow-up for Reporting Results of Spinal Surgery Studies: Is This Guideline Supported by the Literature? International Society for the Study of the Lumbar Spine. May, 2005; New York, New York

116. Araghi A, Guyer RD, Hisey MS, Bradley WD, Sama A, Sukovich W, Hardenbrook M: Evaluation of a Novel Hydrosurgery System for Disc Preparation in Lumbar Interbody Fusion in a Cadaver Model. International Meeting on Advanced Spine Techniques (IMAST). July, 2005; Banff, Alberta, Canada.

117. Guyer R, Tromanhauser S, Toselli R: An Economic Analysis of Lumbar Total Disc Replacement vs. Fusion. North America Spine Society. Sept-Oct, 2005; Philadelphia, Pennsylvania.

118. Guyer R, Tromanhauser S, Toselli R: An Economic Analysis of Lumbar Total Disc Replacement vs. Fusion. American Association of Neurological Surgeons and Congress of Neurological Surgeons Section on Disorders of the Spine and Peripheral Nerves. March, 2006; Lake Buena Vista, Florida

119. Musante D, Guyer RD: Prospective Randomized Controlled Trial of Kineflex Versus Charite in Lumbar Total Disc Arthroplasty: 3 to 9 Month Follow-up. Spine Arthroplasty Society. May, 2006; Montreal, Canada.
121. Araghi A, Bradley W, Guyer R, Hardenbrook M, Hisey M, Sukovich W, Taddonio R: Efficacy of Disc Space Preparation for Transforaminal Lumbar Interbody Fusion: A Comparative Study of a Novel Hydrosurgical Technique to Conventional Methods in a Cadaver Model. Spine Arthroplasty Society. May, 2006; Montreal, Canada.

122. Lhamby J, Guyer R, Zigler J, Blumenthal S, Sachs B, Hochschuler S, Rashbaum R, Ohnmeiss D: Patients Undergoing Total Disc Replacement with Spinal Fusion at Different Lumbar Levels. Spine Arthroplasty Society. May, 2006; Montreal, Canada.

123. Ohnmeiss DD, Blumenthal SL, Guyer RD, Hochschuler SH: Analysis of Change in Outcome Measures at Various Follow-Up Periods: Data from a Prospective Trial. Spine Arthroplasty Society. May, 2006; Montreal, Canada.

124. Siddiqui S, Guyer R, Zigler J, Ohnmeiss D, Blumenthal S, Sachs B, Hochschuler S, Rashbaum R: Factors Related to the 20 Best and 20 Worst 24-month Outcomes of Total Disc Replacement in Prospective Trials. International Society for the Study of the Lumbar Spine. June, 2006; Bergen, Norway.

125. Guyer R, Blumenthal S, Geisler R, McAfee P, J Regan J: The First Year Following FDA Approval of the Charite Artificial Disc: “Real World” Adverse Events Outside an IDE Study Environment. International Society for the Study of the Lumbar Spine. June, 2006; Bergen, Norway.

126. Blumenthal SL, Guyer RD, Geisler FH, McAfee PC: One-Level Lumbar Arthroplasty in Patients 18-45 Years of Age vs. Patients 46-60 Years of Age: Is There a Difference in Clinical Outcome? International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

127. Blumenthal SL, Ohnmeiss DD, Lhamby JL, Hochschuler SH, Zigler JE, Guyer RD, Sachs BL, Rashbaum RF: Patients Undergoing Total Disc Replacement with Spinal Fusion at Different Lumbar Levels. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

128. Hochshuler SH, Ohnmeiss DD, Blumenthal SL, Guyer RD: Results of Two-Level Total Disc Replacement Using CHARITÉ Artificial Disc. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

129. Ohnmeiss DD, Hochschuler SH, Blumenthal SL, Guyer RD: analysis of Change in Outcome Measures at Various Follow-Up Periods: Data from a Prospcective Trial. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

130. Ohnmeiss DD, Hochschuler SH, Guyer RD: Analysis of Lumbar Disc-Related Pain Mechanisms. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

131. McAfee PC, Geisler FH, Blumenthal SL, Guyer RD, Regan J, Stadlan N, Dabbah M, Siddiqi F, Hayes V, Ohnmeiss DD: Predicted 5-year Survivorship of the CHARITÉ Artificial Disc vs. Anterior Lumbar Interbody Fusion: A Kaplan-Meyer Analysis. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

132. Jenis LG, Banco RJ, Tromanhauser SG, Bitan FD, Hochschuler SH, Guyer RD, Holt RT, Majd ME, McAfee PC, Regan J: Return-to-Work Following Treatment with CHARITÉ Artificial Disc versus Anterior Lumbar Interbody Fusion in Patients with Degenerative Disc Disease. International Meeting on Advanced Spine Techniques (IMAST). July, 2006; Athens, Greece.

133. Guyer RD, Banco RJ, Bitan FD, Blumenthal SL, Cappucino A, Geisler FH, Hochschuler SH, Holt RT, Jenis, MD, Majd ME, McAfee PC, Mullin BB, Regan JJ, Stadlan N, Tromanhauser SG, Wong D. Lumbar Arthroplasty vs. Anterior Interbody Fusion at One-Level: Clinical Results at 5-Year Follow-Up from the IDE Study of the Charité Artificial Disc. North American Spine Society. September, 2006; Seattle, Washington.

134. Blumenthal SL, Guyer RD, Geisler FH, McAfee PC, Regan JJ. The First Year Following FDA Approval of the Charité Artificial Disc: “Real World” Adverse Events Outside an IDE Study Environment. North American Spine Society. September, 2006; Seattle, Washington.

135. Lhamby J, Blumental SL, Guyer RD, Zigler JE, Ohnmeiss DD, Sachs BL, Hochschuler SH, Rashbaum RF. Patients Undergoing Total Disc Replacement with Spinal Fusion at Different Lumbar Levels. North American Spine Society. September, 2006; Seattle, Washington.

136. Zigler JE, Guyer R, Gill K, Balderson B, Cammisa F, Linovitz R: Two-year Follow-up from 5 Centers Participating in the ProDisc-C IDE Trial. Cervical Spine Research Society. November-December, 2006; Palm Beach, Florida.

137. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ: Patient Selection for Lumbar Arthroplasty and Arthrodesis: The Crossover Effect in a Controlled, Multi-Center, Randomized Study. Congress of Neurological Surgeons/American Association of Neurological Surgeons Section on Disorders of the Spine and Peripheral Nerves. April, 2007; Washington, D.C.

138. Ohnmeiss DD, Guyer RD, Rashbaum RF: What Constitutes Success in Lumbar Spine Surgery? Spine Arthroplasty Society. May, 2007; Berlin, Germany.

139. Blumenthal SB, Zigler JE, Guyer RD, Ohnmeiss DD: Comparison of Charite vs. ProDisc for the Treatment of Single-level Symptomatic Disc Degeneration: Prospective Data from One Center. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

140. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: A Prospective Randomized Study Comparing Two Lumbar Total Disc Replacement Devices. Spine Arthroplasty Society. May, 2007; Berlin, Germany.
141. Roybal R, Hisey MS, Zigler JE, Sachs BL, Rashbaum RF, Guyer RD, Ohnmeiss DD: Minimally Invasive Pedicle Screw Placement: A Comparison to Open Surgery. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

142. Rohan MX, Ohnmeiss DD, Guyer RD, Zigler JE, Blumenthal SL, Hochschuler SH, Sachs BL, Rashbaum RF: Relationship between the Length of Time Off Work Pre-operatively and Clinical Outcome at 24-month Follow-up. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

143. Geisler FH, Guyer RD, Blumenthal SL, McAfee PC, Cappuccino A, Bitan F, Regan JJ: Patient Selection for Lumbar Arthroplasty and Arthrodesis: The Crossover Effect in a Controlled, Multi-Center, Randomized Study. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

144. McAfee PC, Cunningham B, Geisler FH, Guyer RD, Regan JJ, Blumenthal SL, Cappuccino A: Correlation of the Global Range of Motion (L3 to S1) between In Vitro Benchtop ROM and Clinical ROM from the Charite Artificial Disc FDA Level I Data. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

145. Guyer RD, Blumenthal SL, McAFee PC, Geisler F. The Effect of Age on Outcomes in Patients with One-level Arthroplasty. Spine Arthroplasty Society. May, 2007; Berlin, Germany.

146. Roybal R, Hisey MS, Zigler JE, Sachs BL, Rashbaum RF, Guyer RD, Ohnmeiss DD: Minimally Invasive Pedicle Screw Placement: A Comparison to Open Surgery. International Society for the Study of the Lumbar Spine. June, 2007; Hong Kong, China.

147. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: A Prospective Randomized Study Comparing Two Lumbar Total Disc Replacement Devices. International Society for the Study of the Lumbar Spine. June, 2007; Hong Kong, China.

148. Blumenthal SL, Zigler JE, Guyer RD, Ohnmeiss DD: Similarities and Differences in Clinical and Radiographic Outcomes of Two US IDE Trials for Lumbar Disc Replacement. International Society for the Study of the Lumbar Spine. June, 2007; Hong Kong, China.

149. Ohnmeiss DD, Guyer RD, Rashbaum RF: What Constitutes Success in Lumbar Spine Surgery? International Meeting on Advanced Spinal Techniques (IMAST). July, 2007; Paradise, Bahamas.

150. Yakel D, Guyer RD, Zigler JE, Ohnmeiss DD: Complications, Re-operations, and Outcome of Anterior Cervical Fusion Using Plates. World Spine. July, 2007; Istanbul, Turkey.

151. Rohan MX, Ohnmeiss DD, Guyer RD, Zigler JE, Blumenthal SL, Hochschuler SH, Sachs BL, Rashbaum RF: Relationship between the Length of Time Off Work Pre-operatively and Clinical Outcome at 24-month Follow-up. North American Spine Society. October, 2007; Austin, Texas.
152. Guyer RD, Blumenthal SL, Hochschuler SH, Ohnmeiss DD: A Prospective Randomized Study Comparing Two Lumbar Total Disc Replacement Devices. North American Spine Society. October, 2007; Austin, Texas.

153. Ohnmeiss D, Guyer R, Blumenthal S, Hochschuler S: Analysis Of Total Disc Replacement Data With Respect To Published MCID (Minimal Clinically Important Difference) Values. North American Spine Society. October, 2007; Austin, Texas.

154. McAfee PC, Cunningham BW, Geisler F, Guyer RD, Blumenthal SL, Cappuccino A, Regan JJ: A Comparison of In Vivo and In Vitro Range of Motion Distribution Following One-Level Lumbar Arthroplasty —2 to 5 year Radiographic Follow up of 375 Consecutive Patients Enrolled in the CHARITÉ Artificial Disc FDA Level I Pivotal Trial. North American Spine Society. October, 2007; Austin, Texas.

155. Lieberman I, Hardenbrook M, Wang J,Guyer R, Khanna J: Radiation Exposure Using Miniature Robotic Guidance for Spinal Surgery. North American Spine Society. October, 2007; Austin, Texas.

156. Guyer R, Lauryssen C, Blumenthal B: Cervical Total Disc Replacement: a Prospective Randomized Comparison to Fusion. Asian Pacific Spine Arthroplasty Society. January, 2008; Seoul, South Korea.

158. Geisler FH, Guyer RD, McAfee PC, Regan JJ, Blumenthal SL, Majd ME, Holt RT, Banco RJ: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar Fusion: Effect at 5-year Follow-up of Prior Discectomy on Clinical Outcomes Following Lumbar Arthroplasty. Congress of Neurological Surgeons/American Association of Neurological Surgeons. February, 2008; Orlando, Florida.

159. Araghi A, Hisey MS, Zigler JE, Guyer RD, Sachs BL, Rashbaum RF, Ohnmeiss DD: Comparison of Open vs. Minimally Invasive Surgical Technique for Posterior Lumbar Fusion. Spine Arthroplasty Society. May, 2008; Miami, Florida.

160. Araghi A, Hisey MS, Zigler JE, Guyer RD, Sachs BL, Rashbaum RF, Ohnmeiss DD: Comparison of Open vs. Minimally Invasive Surgical Technique for Posterior Lumbar Fusion. Congress of Neurological Surgeons/American Association of Neurological Surgeons Section on Disorders of the Spine and Peripheral Nerves. February, 2008; Orlando, Florida.

161. Blumenthal SL, Bitan FD, Cappuccino A, Geisler FH, Guyer RD, McAfee PC: A New Registry for the Advancement of Arthroplasty: The Center for Arthroplasty Research and Education (CARES). Spine Arthroplasty Society. May, 2008; Miami, Florida.

162. Guyer RD, Lauryssen C, Blumenthal SL: A Prospective Randomized Study Comparing Cervical Total Disc Replacement to Fusion. Spine Arthroplasty Society. May, 2008; Miami, Florida.

163. Guyer RD: A Clinical Evaluation of Anular Repair Post Lumbar Discectomy. Spine Arthroplasty Society. May, 2008; Miami, Florida.
164. McAfee PC, Banco RJ, Blumenthal SL, Geisler FH, Guyer RD, Holt RT, Majd ME: Prospective, Randomized, Multicenter FDA IDE Study of CHARITÉ Artificial Disc vs. Lumbar fusion: Effect at 5-year follow-up of Prior Surgery on Clinical outcomes following lumbar arthroplasty. Spine Arthroplasty Society. May, 2008; Miami, Florida.

165. Ohnmeiss DD, Guyer RD, Blumenthal SL, Hochschuler SH: Analysis of Total Disc Replacement Outcomes When Applying MCID (Minimal Clinically Important Difference) Criteria. Spine Arthroplasty Society. May, 2008; Miami, Florida.

166. Roush TF, Blumenthal SL, Guyer RD, Ohnmeiss DD: Analysis of Hybrid (Total Disc Replacement / Fusion Constructs) in the Lumbar Spine: A Comparison with Two-Level Total Disc Replacement. Spine Arthroplasty Society. May, 2008; Miami, Florida.

167. Ohnmeiss DD, Guyer RD, Blumenthal SL, Hochschuler SH: Analysis of Total Disc Replacement Outcomes When Applying MCID (Minimal Clinically Important Difference) Criteria. International Society for the Study of the Lumbar Spine. May 2008; Geneva, Switzerland.

168. Roush TF, Blumenthal SL, Guyer RD, Ohnmeiss DD: Analysis of Hybrid (Total Disc Replacement/Fusion Constructs) in the Lumbar Spine: A Comparison with Two-level Total Disc Replacement. North American Spine Society SpineWeek. May 2008; Geneva, Switzerland.

169. Guyer RD, McAfee PC, Banco RJ, Bitan F, Cappuccino A, Geisler FH, Hochschuler SH, Jenis LG, Regan JJ, Blumenthal SL: Prospective, Randomized, Multi-center Food and Drug Administration Investigational Device Exemption Study of Lumbar Total Disc Replacement with the Charite Artificial Disc versus Lumbar Fusion. Eurospine. May, 2008; Geneva, Switzerland.
170. Hardenbrook M, Lieberman I, Khanna AJ, Guyer RD, Wan J: Accuracy, Radiation and Procedure Time – Efficacy of Miniature Robotic Guidance in Spinal Surgery. Eurospine. May, 2008; Geneva, Switzerland.
171. Banco RJ, Geisler FH, Guyer RD, Hetzell BM, Holt RT, Majd ME: Prospective, Randomized, Multi-center FDA IDE Study of Charite Artificial Disc vs. Lumbar Fusion: Fusion: Effect at 5-year Follow-up of Age on Clinical Outcomes Following Lumbar Arthroplasty. Eurospine. May, 2008; Geneva, Switzerland.

172. Wong DC, Jenis LG MD, Guyer RD, Banco RJ, Geisler FH, Holt RT, Majd ME, Regan JJ, Blumenthal SL, DeMuth GE, Hetzell BC: Is Preoperative Disc Height a Contributing Factor in 5-year Success Rate with Arthrodesis and Arthroplasty? International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.

173. Guyer RD, Geisler FH, Majd ME, Holt RT, Regan JJ, Blumenthal SL, Wong DC, Jenis LG, Banco RJ: The Impact of Preoperative DEXA Scores Following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year Follow-up Study. International Meeting on Advanced Spinal Techniques (IMAST). July, 2008; Hong Kong, China.
174. Blumenthal S, Zigler J, Guyer R, Waldrip A, Ohnmeiss D: A Prospective Randomized Comparison of Cervical Disc Replacement and Anterior Cervical Fusion. North American Spine Society. October, 2008; Toronto, Canada.

175. Majd M, Holt R, Guyer RD, Banco R, Geisler F, Jenis L, Regan J, Wong D, Blumenthal S: Two- and Five-year Lumbar Index-level Motion Following Arthroplasty: Impact of Heterotopic Ossification. North American Spine Society. October, 2008; Toronto, Canada.

176. Guyer RD, Geisler F, Holt RT, Majd M, Regan J, Wong D, Jenis L, Banco R, Blumenthal S, Demuth G, Hetzell B: The Impact of Postoperative Disc Height following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year Follow-up Study. North American Spine Society. October, 2008; Toronto, Canada.

177. Guyer RD, Lauryssen C, Blumenthal S: Prospective Randomized Study Comparing Cervical Total Disc Replacement to Anterior Cervical Fusion. North American Spine Society. October, 2008; Toronto, Canada.

178. Guyer RD, Blumenthal SL, Zigler JE, Waldrip AM, Ohnmeiss DD: A Prospective Randomized Comparison of Cervical Disc Replacement and Anterior Cervical Fusion. Cervical Spine Research Society. December, 2008; Austin, Texas.

179. Guyer RD, Lauryssen C, Blumenthal SL: Cervical Total Disc Replacement: A Prospective, Randomized Comparison to Anterior Cervical Fusion. Cervical Spine Research Society. December, 2008; Austin, Texas.

180. Majd M, Holt R, Guyer RD, Banco R, Geisler F, Jenis L, Regan J, Wong D, Blumenthal S: Two- and Five-year Lumbar Index-level Motion Following Arthroplasty: Impact of Heterotopic Ossification. American Association of Neurological Surgeons / Congress of Neurological Surgeons. March, 2009; Phoenix, Arizona.

181. Wong DC, Jenis LG, Guyer RD, Banco RJ, Geisler FH, Holt RT, Majd ME, Regan JJ, Blumenthal SL, DeMuth GE, Hetzell BC: Is Preoperative Disc Height a Contributing Factor in 5-year Success Rate with Arthrodesis and Arthroplasty? American Association of Neurological Surgeons / Congress of Neurological Surgeons. March, 2009; Phoenix, Arizona.

182. Guyer RD, Geisler FH, Majd ME, Holt RT, Regan JJ, Blumenthal SL, Wong DC, Jenis LG, Banco RJ: The Impact of Preoperative DEXA Scores Following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year Follow-up Study. American Association of Neurological Surgeons / Congress of Neurological Surgeons. March, 2009; Phoenix, Arizona.

183. Guyer RD, Geisler F, Holt RT, Majd M, Regan J, Wong D, Jenis L, Banco R, Blumenthal S, Demuth G, Hetzell B: The Impact of Postoperative Disc Height following Arthroplasty on Long-term Clinical and Radiographic Outcomes – a 5-Year Follow-up Study. American Association of Neurological Surgeons / Congress of Neurological Surgeons. March, 2009; Phoenix, Arizona.

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