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    Benjamin Ma, MD

    TitleAssociate Professor
    SchoolUCSF School of Medicine
    DepartmentOrthopaedic Surgery
    Address1500 Owens Street
    San Fancisco CA 94158
    Phone415-353-7566

       Biography 
       Awards and Honors
      UCSF2011 - 2012Henry Kaiser Award for Excellent in Teaching in the Ambulatory Care Setting
      American Shoulder and Elbow Society2011 - 2012Charles S Neer Award
      Orthopaedic Research Society2009 - 2010New Investigator Research Award (Principle Investigator)
      AOSSM2009 - 2010APOSSM/AOSSM Travelling Fellowship
      ISAKOS2009 - 2010Excellence in Patellofemoral Research Award
      UCSF2008 - 2009Excellence in Teaching Award for Clinical Teaching Faculty
      UCSF2005 - 2006UCSF Orthopaedic Surgery Teaching Award
      Orthopaedic Research Society2004 - 2005New Investigator Research Award

       Overview 
       Overview
      Dr. C. Benjamin Ma is the chief of the UCSF Sports Medicine and Shoulder Service. His special interests include sports medicine, arthroscopic shoulder surgery to repair rotator cuff tears and ligament instability, shoulder replacement, knee ligament reconstruction, meniscus and cartilage injury, and elbow arthroscopy. He has received many clinical and research awards which include the UCSF Exceptional Physician Award, Henry Kaiser Award for Excellent in Teaching and UCSF Excellent in Teaching Award.
      In addition to his clinical specialties, Dr. Ma is involved in research on cartilage imaging and dynamic magnetic resonance imaging (MRI) scans of ACL injured knees. He has also extensive publications on the improvement of outcomes following rotator cuff surgeries and replacements. His research has received the prestigious Charles Neer Award from American Shoulder and Elbow Society, Excellence in Patellofemoral Research from the International Society for Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine and New Investigator Research Award from the Orthopaedic Research Society.
      Dr. Ma completed his undergraduate education in bioelectrical engineering at Brown University and went on to earn his medical degree from Johns Hopkins University. He completed his residency in orthopedic surgery at the University of Pittsburgh, where he also 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


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       Bibliographic 
       Publications
      Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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      1. 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. 2013 Sep 24.
        View in: PubMed
      2. 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.
        View in: PubMed
      3. 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.
        View in: PubMed
      4. Kuhn JE, Dunn WR, Sanders R, An Q, Baumgarten KM, Bishop JY, Brophy RH, Carey JL, Holloway BG, Jones GL, Ma CB, Marx RG, McCarty EC, Poddar SK, Smith MV, Spencer EE, Vidal AF, Wolf BR, Wright RW. Effectiveness of physical therapy in treating atraumatic full-thickness rotator cuff tears: a multicenter prospective cohort study. J Shoulder Elbow Surg. 2013 Oct; 22(10):1371-9.
        View in: PubMed
      5. Radiographic findings in revision anterior cruciate ligament reconstructions from the Mars cohort. J Knee Surg. 2013 Aug; 26(4):239-47.
        View in: PubMed
      6. Theologis AA, Haughom B, Liang F, Zhang Y, Majumdar S, Link TM, Ma CB, Li X. Comparison of T1rho relaxation times between ACL-reconstructed knees and contralateral uninjured knees. Knee Surg Sports Traumatol Arthrosc. 2014 Feb; 22(2):298-307.
        View in: PubMed
      7. Jungmann PM, Li X, Nardo L, Subburaj K, Lin W, Ma CB, Majumdar S, Link TM. Do cartilage repair procedures prevent degenerative meniscus changes?: longitudinal t1? and morphological evaluation with 3.0-T MRI. Am J Sports Med. 2012 Dec; 40(12):2700-8.
        View in: PubMed
      8. Kim JM, Ma CB. Quantitative MRI of the ACL-injured and reconstructed knee. Clin Sports Med. 2013 Jan; 32(1):21-36.
        View in: PubMed
      9. Morgan JA, Dahm D, Levy B, Stuart MJ. Femoral tunnel malposition in ACL revision reconstruction. J Knee Surg. 2012 Nov; 25(5):361-8.
        View in: PubMed
      10. Barry JJ, Lansdown DA, Cheung S, Feeley BT, Ma CB. The relationship between tear severity, fatty infiltration, and muscle atrophy in the supraspinatus. J Shoulder Elbow Surg. 2013 Jan; 22(1):18-25.
        View in: PubMed
      11. Kothari A, Haughom B, Subburaj K, Feeley B, Li X, Ma CB. Evaluating rotational kinematics of the knee in ACL reconstructed patients using 3.0 Tesla magnetic resonance imaging. Knee. 2012 Oct; 19(5):648-51.
        View in: PubMed
      12. Haughom BD, Souza R, Schairer WW, Li X, Ma CB. Evaluating rotational kinematics of the knee in ACL-ruptured and healthy patients using 3.0 Tesla magnetic resonance imaging. Knee Surg Sports Traumatol Arthrosc. 2012 Apr; 20(4):663-70.
        View in: PubMed
      13. Theologis AA, Schairer WW, Carballido-Gamio J, Majumdar S, Li X, Ma CB. Longitudinal analysis of T1? and T2 quantitative MRI of knee cartilage laminar organization following microfracture surgery. Knee. 2012 Oct; 19(5):652-7.
        View in: PubMed
      14. Schairer WW, Haughom BD, Morse LJ, Li X, Ma CB. Magnetic resonance imaging evaluation of knee kinematics after anterior cruciate ligament reconstruction with anteromedial and transtibial femoral tunnel drilling techniques. Arthroscopy. 2011 Dec; 27(12):1663-70.
        View in: PubMed
      15. Haughom B, Schairer W, Souza RB, Carpenter D, Ma CB, Li X. Abnormal tibiofemoral kinematics following ACL reconstruction are associated with early cartilage matrix degeneration measured by MRI T1rho. Knee. 2012 Aug; 19(4):482-7.
        View in: PubMed
      16. Baumgarten KM, Carey JL, Abboud JA, Jones GL, Kuhn JE, Wolf BR, Brophy RH, Cox CL, Wright RW, Vidal AF, Ma CB, McCarty EC, Holloway GB, Spencer EE, Dunn WR. Reliability of determining and measuring acromial enthesophytes. HSS J. 2011 Oct; 7(3):218-22.
        View in: PubMed
      17. Chu T, McDonald E, Tufaga M, Kandemir U, Buckley J, Ma CB. Comparison of completely knotless and hybrid double-row fixation systems: a biomechanical study. Arthroscopy. 2011 Apr; 27(4):479-85.
        View in: PubMed
      18. Cheung S, Dillon E, Tham SC, Feeley BT, Link TM, Steinbach L, Ma CB. The presence of fatty infiltration in the infraspinatus: its relation with the condition of the supraspinatus tendon. Arthroscopy. 2011 Apr; 27(4):463-70.
        View in: PubMed
      19. Cheung SC, Allen CR, Gallo RA, Ma CB, Feeley BT. Patients' attitudes and factors in their selection of grafts for anterior cruciate ligament reconstruction. Knee. 2012 Jan; 19(1):49-54.
        View in: PubMed
      20. Li X, Kuo D, Theologis A, Carballido-Gamio J, Stehling C, Link TM, Ma CB, Majumdar S. Cartilage in anterior cruciate ligament-reconstructed knees: MR imaging T1{rho} and T2--initial experience with 1-year follow-up. Radiology. 2011 Feb; 258(2):505-14.
        View in: PubMed
      21. Theologis AA, Kuo D, Cheng J, Bolbos RI, Carballido-Gamio J, Ma CB, Li X. Evaluation of bone bruises and associated cartilage in anterior cruciate ligament-injured and -reconstructed knees using quantitative t(1?) magnetic resonance imaging: 1-year cohort study. Arthroscopy. 2011 Jan; 27(1):65-76.
        View in: PubMed
      22. Wheeler DJ, Garabekyan T, Lugo R, Buckley JM, Jones C, Lotz M, Lotz JC, Ma CB. Biomechanical comparison of transosseous versus suture anchor repair of the subscapularis tendon. Arthroscopy. 2010 Apr; 26(4):444-50.
        View in: PubMed
      23. Wong JE, Aviles SA, Ma CB. Intraosseous ganglion of the glenoid. Am J Orthop (Belle Mead NJ). 2010 Feb; 39(2):E19-21.
        View in: PubMed
      24. Shin CS, Carpenter RD, Majumdar S, Ma CB. Three-dimensional in vivo patellofemoral kinematics and contact area of anterior cruciate ligament-deficient and -reconstructed subjects using magnetic resonance imaging. Arthroscopy. 2009 Nov; 25(11):1214-23.
        View in: PubMed
      25. Jones C, Reddy S, Ma CB. Repair of the posterior root of the medial meniscus. Knee. 2010 Jan; 17(1):77-80.
        View in: PubMed
      26. Ma CB, Keifa E, Dunn W, Fu FH, Harner CD. Can pre-operative measures predict quadruple hamstring graft diameter? Knee. 2010 Jan; 17(1):81-3.
        View in: PubMed
      27. Carpenter RD, Majumdar S, Ma CB. Magnetic resonance imaging of 3-dimensional in vivo tibiofemoral kinematics in anterior cruciate ligament-reconstructed knees. Arthroscopy. 2009 Jul; 25(7):760-6.
        View in: PubMed
      28. Li X, Pai A, Blumenkrantz G, Carballido-Gamio J, Link T, Ma B, Ries M, Majumdar S. Spatial distribution and relationship of T1rho and T2 relaxation times in knee cartilage with osteoarthritis. Magn Reson Med. 2009 Jun; 61(6):1310-8.
        View in: PubMed
      29. Wong S, Steinbach L, Zhao J, Stehling C, Ma CB, Link TM. Comparative study of imaging at 3.0 T versus 1.5 T of the knee. Skeletal Radiol. 2009 Aug; 38(8):761-9.
        View in: PubMed
      30. Stahl R, Krug R, Kelley DA, Zuo J, Ma CB, Majumdar S, Link TM. Assessment of cartilage-dedicated sequences at ultra-high-field MRI: comparison of imaging performance and diagnostic confidence between 3.0 and 7.0 T with respect to osteoarthritis-induced changes at the knee joint. Skeletal Radiol. 2009 Aug; 38(8):771-83.
        View in: PubMed
      31. Lozano J, Saadat E, Li X, Majumdar S, Ma CB. Magnetic resonance T(1 rho) imaging of osteoarthritis: a rabbit ACL transection model. Magn Reson Imaging. 2009 Jun; 27(5):611-6.
        View in: PubMed
      32. Bolbos RI, Ma CB, Link TM, Majumdar S, Li X. In vivo T1rho quantitative assessment of knee cartilage after anterior cruciate ligament injury using 3 Tesla magnetic resonance imaging. Invest Radiol. 2008 Nov; 43(11):782-8.
        View in: PubMed
      33. Bauer JS, Barr C, Henning TD, Malfair D, Ma CB, Steinbach L, Link TM. Magnetic resonance imaging of the ankle at 3.0 Tesla and 1.5 Tesla in human cadaver specimens with artificially created lesions of cartilage and ligaments. Invest Radiol. 2008 Sep; 43(9):604-11.
        View in: PubMed
      34. Stahl R, Luke A, Li X, Carballido-Gamio J, Ma CB, Majumdar S, Link TM. T1rho, T2 and focal knee cartilage abnormalities in physically active and sedentary healthy subjects versus early OA patients--a 3.0-Tesla MRI study. Eur Radiol. 2009 Jan; 19(1):132-43.
        View in: PubMed
      35. Li X, Ma BC, Bolbos RI, Stahl R, Lozano J, Zuo J, Lin K, Link TM, Safran M, Majumdar S. Quantitative assessment of bone marrow edema-like lesion and overlying cartilage in knees with osteoarthritis and anterior cruciate ligament tear using MR imaging and spectroscopic imaging at 3 Tesla. J Magn Reson Imaging. 2008 Aug; 28(2):453-61.
        View in: PubMed
      36. Bolbos RI, Link TM, Ma CB, Majumdar S, Li X. T1rho relaxation time of the meniscus and its relationship with T1rho of adjacent cartilage in knees with acute ACL injuries at 3 T. Osteoarthritis Cartilage. 2009 Jan; 17(1):12-8.
        View in: PubMed
      37. Lugo R, Kung P, Ma CB. Shoulder biomechanics. Eur J Radiol. 2008 Oct; 68(1):16-24.
        View in: PubMed
      38. Stahl R, Luke A, Ma CB, Krug R, Steinbach L, Majumdar S, Link TM. Prevalence of pathologic findings in asymptomatic knees of marathon runners before and after a competition in comparison with physically active subjects-a 3.0 T magnetic resonance imaging study. Skeletal Radiol. 2008 Jul; 37(7):627-38.
        View in: PubMed
      39. Bolbos RI, Zuo J, Banerjee S, Link TM, Ma CB, Li X, Majumdar S. Relationship between trabecular bone structure and articular cartilage morphology and relaxation times in early OA of the knee joint using parallel MRI at 3 T. Osteoarthritis Cartilage. 2008 Oct; 16(10):1150-9.
        View in: PubMed
      40. Spencer EE, Dunn WR, Wright RW, Wolf BR, Spindler KP, McCarty E, Ma CB, Jones G, Safran M, Holloway GB, Kuhn JE. Interobserver agreement in the classification of rotator cuff tears using magnetic resonance imaging. Am J Sports Med. 2008 Jan; 36(1):99-103.
        View in: PubMed
      41. Rodeo SA, Kawamura S, Ma CB, Deng XH, Sussman PS, Hays P, Ying L. The effect of osteoclastic activity on tendon-to-bone healing: an experimental study in rabbits. J Bone Joint Surg Am. 2007 Oct; 89(10):2250-9.
        View in: PubMed
      42. Iyengar J, Luke A, Ma CB. An unusual presentation of synovial chondromatosis of the knee: a case report. Clin J Sport Med. 2007 Mar; 17(2):157-9.
        View in: PubMed
      43. Lozano J, Ma CB, Cannon WD. All-inside meniscus repair: a systematic review. Clin Orthop Relat Res. 2007 Feb; 455:134-41.
        View in: PubMed
      44. Ma CB, Kawamura S, Deng XH, Ying L, Schneidkraut J, Hays P, Rodeo SA. Bone morphogenetic proteins-signaling plays a role in tendon-to-bone healing: a study of rhBMP-2 and noggin. Am J Sports Med. 2007 Apr; 35(4):597-604.
        View in: PubMed
      45. Barr C, Bauer JS, Malfair D, Ma B, Henning TD, Steinbach L, Link TM. MR imaging of the ankle at 3 Tesla and 1.5 Tesla: protocol optimization and application to cartilage, ligament and tendon pathology in cadaver specimens. Eur Radiol. 2007 Jun; 17(6):1518-28.
        View in: PubMed
      46. Majumdar S, Li X, Blumenkrantz G, Saldanha K, Ma CB, Kim H, Lozano J, Link T. MR imaging and early cartilage degeneration and strategies for monitoring regeneration. J Musculoskelet Neuronal Interact. 2006 Oct-Dec; 6(4):382-4.
        View in: PubMed
      47. Luke A, Ma CB. Exertional thigh pain in a runner. Curr Sports Med Rep. 2006 Sep; 5(5):251-3.
        View in: PubMed
      48. Shefelbine SJ, Ma CB, Lee KY, Schrumpf MA, Patel P, Safran MR, Slavinsky JP, Majumdar S. MRI analysis of in vivo meniscal and tibiofemoral kinematics in ACL-deficient and normal knees. J Orthop Res. 2006 Jun; 24(6):1208-17.
        View in: PubMed
      49. Lozano J, Li X, Link TM, Safran M, Majumdar S, Ma CB. Detection of posttraumatic cartilage injury using quantitative T1rho magnetic resonance imaging. A report of two cases with arthroscopic findings. J Bone Joint Surg Am. 2006 Jun; 88(6):1349-52.
        View in: PubMed
      50. Ma CB, Comerford L, Wilson J, Puttlitz CM. Biomechanical evaluation of arthroscopic rotator cuff repairs: double-row compared with single-row fixation. J Bone Joint Surg Am. 2006 Feb; 88(2):403-10.
        View in: PubMed
      51. Li X, Han ET, Ma CB, Link TM, Newitt DC, Majumdar S. In vivo 3T spiral imaging based multi-slice T(1rho) mapping of knee cartilage in osteoarthritis. Magn Reson Med. 2005 Oct; 54(4):929-36.
        View in: PubMed
      52. Lee KY, Masi JN, Sell CA, Schier R, Link TM, Steinbach LS, Safran M, Ma B, Majumdar S. Computer-aided quantification of focal cartilage lesions using MRI: accuracy and initial arthroscopic comparison. Osteoarthritis Cartilage. 2005 Aug; 13(8):728-37.
        View in: PubMed
      53. MacGillivray JD, Ma CB. An arthroscopic stitch for massive rotator cuff tears: the Mac stitch. Arthroscopy. 2004 Jul; 20(6):669-71.
        View in: PubMed
      54. Ma CB, MacGillivray JD, Clabeaux J, Lee S, Otis JC. Biomechanical evaluation of arthroscopic rotator cuff stitches. J Bone Joint Surg Am. 2004 Jun; 86-A(6):1211-6.
        View in: PubMed
      55. Ma CB, Francis K, Towers J, Irrgang J, Fu FH, Harner CH. Hamstring anterior cruciate ligament reconstruction: a comparison of bioabsorbable interference screw and endobutton-post fixation. Arthroscopy. 2004 Feb; 20(2):122-8.
        View in: PubMed
      56. Ma CB, Kanamori A, Vogrin TM, Woo SL, Harner CD. Measurement of posterior tibial translation in the posterior cruciate ligament-reconstructed knee: significance of the shift in the reference position. Am J Sports Med. 2003 Nov-Dec; 31(6):843-8.
        View in: PubMed
      57. Papageorgiou CD, Ma CB, Abramowitch SD, Clineff TD, Woo SL. A multidisciplinary study of the healing of an intraarticular anterior cruciate ligament graft in a goat model. Am J Sports Med. 2001 Sep-Oct; 29(5):620-6.
        View in: PubMed
      58. Scheffler SU, Clineff TD, Papageorgiou CD, Debski RE, Ma CB, Woo SL. Structure and function of the healing medial collateral ligament in a goat model. Ann Biomed Eng. 2001 Feb; 29(2):173-80.
        View in: PubMed
      59. Kanamori A, Woo SL, Ma CB, Zeminski J, Rudy TW, Li G, Livesay GA. The forces in the anterior cruciate ligament and knee kinematics during a simulated pivot shift test: A human cadaveric study using robotic technology. Arthroscopy. 2000 Sep; 16(6):633-9.
        View in: PubMed
      60. Ma CB, Papageogiou CD, Debski RE, Woo SL. Interaction between the ACL graft and MCL in a combined ACL+MCL knee injury using a goat model. Acta Orthop Scand. 2000 Aug; 71(4):387-93.
        View in: PubMed
      61. Harner CD, Janaushek MA, Ma CB, Kanamori A, Vogrin TM, Woo SL. The effect of knee flexion angle and application of an anterior tibial load at the time of graft fixation on the biomechanics of a posterior cruciate ligament-reconstructed knee. Am J Sports Med. 2000 Jul-Aug; 28(4):460-5.
        View in: PubMed
      62. Ma CB, Janaushek MA, Vogrin TM, Rudy TW, Harner CD, Woo SL. Significance of changes in the reference position for measurements of tibial translation and diagnosis of cruciate ligament deficiency. J Orthop Res. 2000 Mar; 18(2):176-82.
        View in: PubMed
      63. Fu FH, Bennett CH, Ma CB, Menetrey J, Lattermann C. Current trends in anterior cruciate ligament reconstruction. Part II. Operative procedures and clinical correlations. Am J Sports Med. 2000 Jan-Feb; 28(1):124-30.
        View in: PubMed
      64. Harner CD, Vogrin TM, Höher J, Ma CB, Woo SL. Biomechanical analysis of a posterior cruciate ligament reconstruction. Deficiency of the posterolateral structures as a cause of graft failure. Am J Sports Med. 2000 Jan-Feb; 28(1):32-9.
        View in: PubMed
      65. Fu FH, Bennett CH, Lattermann C, Ma CB. Current trends in anterior cruciate ligament reconstruction. Part 1: Biology and biomechanics of reconstruction. Am J Sports Med. 1999 Nov-Dec; 27(6):821-30.
        View in: PubMed
      66. Li G, Rudy TW, Sakane M, Kanamori A, Ma CB, Woo SL. The importance of quadriceps and hamstring muscle loading on knee kinematics and in-situ forces in the ACL. J Biomech. 1999 Apr; 32(4):395-400.
        View in: PubMed
      67. Höher J, Livesay GA, Ma CB, Withrow JD, Fu FH, Woo SL. Hamstring graft motion in the femoral bone tunnel when using titanium button/polyester tape fixation. Knee Surg Sports Traumatol Arthrosc. 1999; 7(4):215-9.
        View in: PubMed
      68. Hai CM, Ma CB. Fluoroaluminate- and GTP gamma S-induced stress, shortening, and myosin phosphorylation in airway smooth muscle. Am J Physiol. 1993 Jul; 265(1 Pt 1):L73-9.
        View in: PubMed
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