Mathias Masem, MD

Orthopedic surgeon

Dr. Mathias Masem is an orthopedic surgeon with more than 20 years experience in hand and upper extremity surgery. He received a medical degree from the University of Minnesota, completed an internship and additional general surgery training and a residency in orthopedic surgery at UCSF and completed a hand surgery fellowship under Dr. Jack Tupper in Oakland. He spent the following two years as an orthopedic research physician in Switzerland at the University of Bern and the Laboratory for Experimental Surgery. Masem obtained his training in hand, upper extremity and microsurgery as a clinical and research fellow at Massachusetts General Hospital and Harvard Medical School.

A UCSF assistant clinical professor of orthopedic surgery, Masem also runs a private practice in Oakland, is chief of the Alta Bates Summit Medical Center Division of Hand Surgery and is a hand and upper extremity injury consultant to the UC Berkeley athletic teams. He has authored numerous articles and given many lectures on basic science and the clinical aspects of upper extremity orthopedic surgery.


Hand, Elbow and Upper Extremity Surgery Center
1500 Owens St.
San Francisco, CA 94158
Phone: (415) 353–2808

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

Conditions & Treatments

Board Certification

Orthopaedic Surgery, American Board of Orthopaedic Surgery
Surgery of the Hand, American Board of Orthopaedic Surgery

Academic Title

Asst Clinical Professor

More about Mathias Masem


University of Minnesota 1975


UCSF Medical Center, Surgery 1976


UCSF Medical Center, Orthopaedic Surgery 1984
UCSF Medical Center, Hand Surgery 1984

Selected Research and Publications

  1. Masem M. Benefits of male circumcision. JAMA. 2012 Feb 01; 307(5):455; author reply 457.
  2. Greenberg BM, Masem M, Wang YX, Rubin P, May JW. Efficacy of intraarterial heparin in maintaining microvascular patency: an experimental model. Plast Reconstr Surg. 1991 May; 87(5):933-40.
  3. Masem M, Greenberg BM, Hoffman C, Hooper DC, May JW. Comparative bacterial clearances of muscle and skin/subcutaneous tissues with and without dead bone: a laboratory study. Plast Reconstr Surg. 1990 May; 85(5):773-81.
  4. Greenberg BM, Masem M, Ragozzino M, Schoenfeld DA, May JW. The role of magnetic resonance imaging in assessing elevated intracompartmental pressure in the rabbit hindlimb. Plast Reconstr Surg. 1988 Oct; 82(4):678-87.
  5. Greenberg BM, Masem M, May JW. Therapeutic value of intravenous heparin in microvascular surgery: an experimental vascular thrombosis study. Plast Reconstr Surg. 1988 Sep; 82(3):463-72.
  6. Jupiter JB, Masem M. Reconstruction of post-traumatic deformity of the distal radius and ulna. Hand Clin. 1988 Aug; 4(3):377-90.
  7. Nevitt MC, Epstein WV, Masem M, Murray WR. Work disability before and after total hip arthroplasty. Assessment of effectiveness in reducing disability. Arthritis Rheum. 1984 Apr; 27(4):410-21.
  8. Masem M. Our political responsibilities as physicians. Minn Med. 1976 Feb; 59(2):135-7.

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.