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C. Benjamin Ma, M.D.

Chief of Sports Medicine

Dr. C. Benjamin Ma is chief of Sports Medicine at UCSF. His special interests include all aspects of shoulder surgery, such as arthroscopy, replacements and tendon transfers; knee arthroscopy surgery such as ligament reconstruction, cartilage replacement and meniscus surgery; and elbow ligament surgery. He also is involved in research on cartilage replacement and imaging as well as the biomechanics of rotator cuff repairs and outcomes. He has received multiple research grants in cartilage and ACL imaging and is involved in multi-center trials in rotator cuff repairs and cartilage resurfacing.

Ma earned an undergraduate degree in bioelectrical engineering at Brown University and a medical degree at Johns Hopkins University. He completed a residency in orthopedic surgery at the University of Pittsburgh, where he completed a one-year musculoskeletal research fellowship. Following his residency, Ma completed a second fellowship in shoulder and knee surgery and sports medicine at the Hospital for Special Surgery in New York.


Arthritis and Joint Replacement Center
1500 Owens St., Suite 430
San Francisco, CA 94158
Phone: (415) 353–2808
Fax: (415) 885–3862

Hours: Monday to Friday, 8 a.m. – 5 p.m.

Cartilage Repair and Regeneration Center
1500 Owens St.
San Francisco, CA 94158
Phone: (415) 353–7566

Hours: Monday to Friday, 8 a.m. – 5 p.m.

Sports Medicine Center
1500 Owens St.
San Francisco, CA 94158
Appointments: (415) 353–2808
Main: (415) 353–9400
Fax: (415) 885–3862

Hours: Monday to Friday, 8 a.m. – 5 p.m.

Conditions & Treatments

More about C. Benjamin Ma


John Hopkins University School of Medicine 1996


University of Pittsburgh Medical Center, Orthopedic Surgery 2002


University of Pittsburgh Medical Center, Musculoskeletal Research 2002
Hospital for Special Surgery, New York, Shoulder and Knee Surgery/Sports Medicine 2003

Selected Research and Publications

  1. Lee S, Lucas RM, Lansdown DA, Nardo L, Lai A, Link TM, Krug R, Ma CB. Magnetic resonance rotator cuff fat fraction and its relationship with tendon tear severity and subject characteristics. J Shoulder Elbow Surg. 2015 Mar 26.
  2. Zaid M, Lansdown D, Su F, Pedoia V, Tufts L, Rizzo S, Souza RB, Li X, Ma CB. Tibial position and arthritis. J Orthop Res. 2015 Feb 26.
  3. Matava MJ, Arciero RA, Baumgarten KM, Carey JL, DeBerardino TM, Hame SL, Hannafin JA, Miller BS, Nissen CW, Taft TN, Wolf BR, Wright RW. Multirater agreement of the causes of anterior cruciate ligament reconstruction failure: a radiographic and video analysis of the Mars cohort. Am J Sports Med. 2015 Feb; 43(2):310-9.
  4. Lance V, Heilmeier UR, Joseph GB, Steinbach L, Ma B, Link TM. MR imaging characteristics and clinical symptoms related to displaced meniscal flap tears. Skeletal Radiol. 2015 Mar; 44(3):375-84.
  5. Berliner JL, Regalado-Magdos A, Ma CB, Feeley BT. Biomechanics of reverse total shoulder arthroplasty. J Shoulder Elbow Surg. 2015 Jan; 24(1):150-60.
  6. Effect of graft choice on the outcome of revision anterior cruciate ligament reconstruction in the Multicenter ACL Revision Study (MARS) Cohort. Am J Sports Med. 2014 Oct; 42(10):2301-10.
  7. Kiet TK, Feeley BT, Naimark M, Gajiu T, Hall SL, Chung TT, Ma CB. Outcomes after shoulder replacement: comparison between reverse and anatomic total shoulder arthroplasty. J Shoulder Elbow Surg. 2015 Feb; 24(2):179-85.
  8. Gupta R, Virayavanich W, Kuo D, Su F, Link T, Ma B, Li X. MR T1? quantification of cartilage focal lesions in acutely injured knees: correlation with arthroscopic evaluation. Magn Reson Imaging. 2014 Dec; 32(10):1290-6.
  9. Nardo L, Ma BC, Steinbach LS. Lesser tuberosity avulsions in adolescents. HSS J. 2014 Oct; 10(3):201-7.
  10. Wright RW. Osteoarthritis Classification Scales: Interobserver Reliability and Arthroscopic Correlation. J Bone Joint Surg Am. 2014 Jul 16; 96(14):1145-1151.
  11. Feeley BT, Zhang AL, Barry JJ, Shin E, Ho J, Tabaraee E, Ma CB. Decreased scapular notching with lateralization and inferior baseplate placement in reverse shoulder arthroplasty with high humeral inclination. Int J Shoulder Surg. 2014 Jul; 8(3):65-71.
  12. Zhang AL, Feeley BT, Schwartz BS, Chung TT, Ma CB. Management of deep postoperative shoulder infections: is there a role for open biopsy during staged treatment? J Shoulder Elbow Surg. 2015 Jan; 24(1):e15-20.
  13. Zhang AL, Gates CH, Link TM, Ma CB. Abnormal origins of the long head of the biceps tendon can lead to rotator cuff pathology: a report of two cases. Skeletal Radiol. 2014 Nov; 43(11):1621-6.
  14. Dunn WR, Kuhn JE, Sanders R, An Q, Baumgarten KM, Bishop JY, Brophy RH, Carey JL, Holloway GB, Jones GL, Ma CB, Marx RG, McCarty EC, Poddar SK, Smith MV, Spencer EE, Vidal AF, Wolf BR, Wright RW. Symptoms of pain do not correlate with rotator cuff tear severity: a cross-sectional study of 393 patients with a symptomatic atraumatic full-thickness rotator cuff tear. J Bone Joint Surg Am. 2014 May 21; 96(10):793-800.
  15. Codsi MJ, Rodeo SA, Scalise JJ, Moorehead TM, Ma CB. Assessment of rotator cuff repair integrity using ultrasound and magnetic resonance imaging in a multicenter study. J Shoulder Elbow Surg. 2014 Oct; 23(10):1468-72.
  16. Kazakia GJ, Tjong W, Nirody JA, Burghardt AJ, Carballido-Gamio J, Patsch JM, Link T, Feeley BT, Ma CB. The influence of disuse on bone microstructure and mechanics assessed by HR-pQCT. Bone. 2014 Jun; 63:132-40.
  17. The duration of symptoms does not correlate with rotator cuff tear severity or other patient-related features: a cross-sectional study of patients with atraumatic, full-thickness rotator cuff tears. J Shoulder Elbow Surg. 2014 Jul; 23(7):1052-8.
  18. Nardo L, Karampinos DC, Lansdown DA, Carballido-Gamio J, Lee S, Maroldi R, Ma CB, Link TM, Krug R. Quantitative assessment of fat infiltration in the rotator cuff muscles using water-fat MRI. J Magn Reson Imaging. 2014 May; 39(5):1178-85.
  19. Su F, Hilton JF, Nardo L, Wu S, Liang F, Link TM, Ma CB, Li X. Cartilage morphology and T1? and T2 quantification in ACL-reconstructed knees: a 2-year follow-up. Osteoarthritis Cartilage. 2013 Aug; 21(8):1058-67.
  20. Chen JL, Allen CR, Stephens TE, Haas AK, Huston LJ, Wright RW, Feeley BT. Differences in mechanisms of failure, intraoperative findings, and surgical characteristics between single- and multiple-revision ACL reconstructions: a MARS cohort study. Am J Sports Med. 2013 Jul; 41(7):1571-8.

Publications are derived from MEDLINE/PubMed and provided by UCSF Profiles, a service of the Clinical & Translational Science Institute (CTSI) at UCSF. Researchers can make corrections and additions to their publications by logging on to UCSF Profiles.