School of Medicine


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  • Geoffrey Abrams, MD

    Geoffrey Abrams, MD

    Associate Professor of Orthopaedic Surgery

    Current Research and Scholarly InterestsDr. Abrams' research is focused on elucidating the pathobiology behind tendinoapthy and developing new treatment modalities for the disease. Specifically, his team is studying the role of micro-RNA as it relates to chronic inflammation and stem cell differentiation in the development and perpetuation of chronic tendinopathy.

  • Derek F. Amanatullah, M.D., Ph.D.

    Derek F. Amanatullah, M.D., Ph.D.

    Associate Professor of Orthopaedic Surgery

    BioDr. Amanatullah specializes in hip and knee replacements for individuals with osteoarthritis, rheumatoid arthritis, infectious arthritis and avascular necrosis. He also performs revision surgeries of knee and hip implants with problems.

  • Tonya Wei An, MD

    Tonya Wei An, MD

    Clinical Assistant Professor, Orthopaedic Surgery

    BioDr. An is a fellowship-trained orthopaedic surgeon specializing in foot and ankle surgery. She provides care at Stanford Health Care locations in Emeryville and Pleasanton.

    Her practice focuses on the diagnosis and treatment, both nonsurgical and surgical, of foot and ankle conditions, including sports injuries, flatfoot deformity, and ankle arthritis. Working with world-class experts at the Hospital for Specialty Surgery, Dr. An is trained in the latest techniques and technologies, ranging from cartilage repair, minimally invasive bunion correction, to total ankle replacement.

    Dr. An is passionate about practicing evidence-based medicine and pursuing research to advance the field of foot and ankle surgery. She works as part of a team with other orthopedic specialists, neurologists, physiatrists, and therapists to help patients achieve the best clinical outcomes. Dr. An believes in understanding each individual’s circumstances and goals to create a personalized care plan. When surgery is deemed the best option, Dr. An guides her patients through every step of getting back on their feet.

    Dr. An has been involved in extensive research studying clinical outcomes after surgical correction of foot deformities caused by Charcot-Marie-Tooth disease, a hereditary condition that results in weaker and smaller muscles. Her work has appeared in several peer-reviewed scientific journals, including Foot & Ankle International and the Journal of Foot and Ankle Surgery, among others. She has also written textbook chapters on flatfoot and bunion surgical techniques, metatarsalgia (pain in the ball of the foot), and Lisfranc (midfoot) injuries.

    Dr. An is a licensed physician in California and New York. She is a member of the Western Orthopaedic Association, American Orthopaedic Foot and Ankle Society (AOFAS), American Academy of Orthopedic Surgeons, and the American Medical Association. She advocates for diversity in the field of medicine and has served organizations such as the Committee on Inclusion, Equity and Advancement and Women in Orthopaedics Outreach Group at her prior institution.