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Stephen Lyman, PhD

About Dr. Lyman


Dr. Lyman’s research interests focus primarily on two disparate areas: evaluation of challenges in access and quality in the musculoskeletal healthcare market and development and evaluation of patient outcomes after orthopedic surgery. Current research interests include developing a short-form patient-reported outcome for hip and knee replacement patients, evaluating new technologies for patient engagement and follow-up, comparative effectiveness of alternative therapies for femoral acetabular impingement of the hip joint, defining the value of orthopedic care delivery, and determining the effect of healthcare market characteristics on hip fracture repair access and outcomes.

Dr. Lyman collaborates closely with orthopedic surgeons, rheumatologists, radiologists, anesthesiologists, biomechanical engineers, hospital administrators, and statisticians at HSS where he directs the Healthcare Research Institute. In that role he oversees the Biostatistics Core for HSS, provides methodological support to the HSS orthopedic registries, and leads research programs in health policy and patient outcome evaluation.

Externally, Dr. Lyman is a consultant with the FDA Center for Device and Radiologic Health in orthopedic device approval. He also consults with the Japanese Orthopaedic Association and Japanese Society for Arthroscopy, Knee Surgery, and Orthopaedic Sports Medicine on survey development. Dr. Lyman serves as an assistant editor for the HSS Journal; on the editorial board of the American Journal of Orthopedics; as a reviewer for BMJ, the American Journal of Sports Medicine, and Clinical Orthopedics and Related Research; and sits on the scientific committee of the International Society for Arthroscopy, Knee Surgery, and Orthopaedic Sports Medicine (ISAKOS). He is a member of ISAKOS, the European Society of Sports Traumatology, Knee Surgery & Arthroscopy (ESSKA), and AcademyHealth.

Patient Registries



Director, Healthcare Research Institute, Hospital for Special Surgery
Associate Scientist, Hospital for Special Surgery
Associate Professor of Public Health, Department of Health Policy and Research, Weill Cornell Medical College



Publications by Dr. Lyman

Editorial Appointments

Deputy Editor of Methodology & Biostatistics, Journal of Bone and Joint Surgery

Selected Publications

1. Dunn WR, Lyman S, Lincoln AE, Amoroso PJ, Wickiewicz T, Marx RG. The effect of ACL reconstruction on the risk of knee reinjury. American Journal of Sports Medicine 32(8):1906-14, 2004.

2. Lyman S, Jones EC, Bach PB, Peterson MGE, Marx RG. The association between hospital volume and total shoulder arthroplasty outcomes. Clinical Orthopaedics and Related Research 432:132-137, 2005.

3. Lyman S, Koulouvaris P, Sherman S, Do H, Mandl LA, Marx RG. Epidemiology of anterior cruciate ligament reconstruction: trends, readmissions, and subsequent knee surgery. Journal of Bone and Joint Surgery (American), 91(10):2321-8, 2009).

4. Lyman S, Oh LS, Reinhardt KR, Mandl LA, Katz JN, Levy BA, Marx RG. Surgical Decision-Making for Arthroscopic Partial Meniscectomy in Patients Over 40. J Arthroscopy, 28(4):492-501, 2012.

5. Potter HG, Sapna KJ, Ma Y, Black BR, Fung S, Lyman S. Cartilage injury following acute, isolated ACL tear: immediate and longitudinal effect with clinical/MRI follow up. Am J Sports Med, 40(2):276-85, 2012.

6. Lyman S, Hidaka C, Valdes A, Hetsroni I, Do H, Dunn W, Marx RG. Risk factors for meniscectomy following meniscal repair. Am J Sports Med, 41(12):2772-8, 2013.

7. Nawabi DH, Gold S, Lyman S, Fields K, Padgett DE, Potter HG. MRI predicts ALVAL and tissue damage in metal-on-metal hip arthroplasty. Clin Orthop Relat Res, 472(2):471-81, 2014.  PMCID: PMC3890156

8. Dy CJ, Marx RG, Bozic KJ, Pan TJ, Padgett DE, Lyman S. Risk factors for revision within 10 years of total knee arthroplasty. Clin Orthop Relat Res, 472(4):1198-1207, 2014. PMCID: PMC3940740

9. Dodwell ER, Lamont LE, Green DW, Pan TJ, Marx RG, Lyman S. 20 years of pediatric anterior cruciate ligament reconstruction in New York state. Am J Sports Med, 42(3):675-80, 2014.

10. Dy CJ, Bozic K, Pan T, Wright T, Padgett D, Lyman S. Risk factors for early revision total hip arthroplasty. Arthritis Care & Research, Jun;66(6):907-15, 2014.

11. Dy CJ, Lyman S, Do HT, Fabricant PD, Marx RG, Green DW. Socioeconomic factors are associated with frequency of emergency department visits for closed pediatric fractures. J Ped Othop, 34(5):548-51, 2014. PMCID: PMC4051828

12. Dy CJ, Bozic KJ, Padgett DE, Pan TJ, Marx RG, Lyman S. Is changing hospitals for revision total joint arthroplasty associated with more complications? Clin Orthop Relat Res, 472(7):2006-15, 2014. PMCID: PMC4048404

Industry Relationships

Industry Relationships

One of the goals of HSS is to advance the science of orthopedic surgery, rheumatology, and related disciplines for the benefit of patients. Research staff at HSS may collaborate with outside companies for education, research and medical advances. HSS supports this collaboration in order to foster medical breakthroughs; however, HSS also believes that these collaborations must be disclosed.

As part of the disclosure process, this website lists Research staff collaborations with outside companies if the Research staff member received any payment during the prior year or expects to receive any payment in the next year. The disclosures are based on information provided by the Research staff and other sources and are updated regularly. Current ownership interests and leadership positions are also listed. Further information may be available on individual company websites.

Below are the healthcare industry relationships reported by Dr. Lyman as of April 10, 2023.

  • CellSource GK - Consultant
  • JOSKAS - Consultant
  • Journal of Bone and Joint Surgery - Editorial Board

By disclosing the collaborations of HSS Research staff with industry on this website, HSS and its Research staff make this information available to patients and the public, thus creating a transparent environment for those who are interested in this information. Further, the HSS Conflicts of Interest Policy does not permit payment of royalties on products developed by him/her that are used on patients at HSS.

Feel free to ask the Research staff member about their relationship(s).

Dr. Lyman in the News