School of Medicine


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  • Geoffrey Abrams, MD

    Geoffrey Abrams, MD

    Associate Professor of Orthopaedic Surgery
    On Partial Leave from 07/01/2024 To 07/31/2024

    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.

  • Todd Alamin, MD, FAAOS

    Todd Alamin, MD, FAAOS

    Professor of Orthopaedic Surgery

    BioDr. Alamin is a board-certified, fellowship-trained orthopaedic surgeon and spine surgeon at Stanford Health Care Orthopaedics and Sports Medicine. He is director of the Spine Surgery Fellowship Program and the Minimally Invasive Spine Center and a professor in the Department of Orthopaedic Surgery at Stanford University School of Medicine. Dr. Alamin completed his spine care and surgery fellowship training at Stanford University School of Medicine/St. Mary’s Medical Center.

    Dr. Alamin specializes in advanced, minimally invasive treatments for a range of conditions affecting the spine. He is skilled at relieving pain that results from spinal stenosis, scoliosis, degenerative disc disease, arthritis, and traumatic injuries. He combines extensive expertise with decades of experience to deliver innovative, personalized care to each of his patients.

    Dr. Alamin’s research interests include effective treatments for vertebral fractures, spinal deformities, scoliosis, herniated discs, and spondylolisthesis (when a vertebra slides out of place). As principal investigator for multiple clinical trials and research studies, Dr. Alamin has explored nerve ablation as a treatment for chronic low back pain and motion-preserving lumbar fusion techniques. He uses state-of-the-art medical devices, implants, and technology to make spine surgery more effective and help his patients move without pain.

    Dr. Alamin is known around the world for the treatment of spine disorders and injuries. He has published more than 65 articles in numerous peer-reviewed journals, including Spine, The Spine Journal, Clinical Spine Surgery, International Journal of Spine Surgery, and Journal of Orthopaedic Research. He has also written several book chapters that focus on diagnosing and treating spine conditions.

    A recognized leader in innovative spine surgery techniques, Dr. Alamin has invented dozens of medical devices, methods, and techniques for spine surgery. He holds a number of patents for his inventions, many of which have revolutionized back pain treatments. Physicians around the globe use his techniques and devices to help their patients with spine conditions.

    Dr. Alamin has been invited to present at conferences around the globe about spinal fusion procedures, novel techniques to treat spinal stenosis, and the latest medical devices to treat degenerative spondylolisthesis. He has lectured at annual meetings for the Association of Bone and Joint Surgeons, the North American Spine Society, and the International Society for the Study of the Lumbar Spine.

    Dr. Alamin is a fellow of the American Academy of Orthopaedic Surgeons. He is a member of the North American Spine Society, the International Society for the Study of the Lumbar Spine, the Spine Arthroplasty Society, and the Society for Minimally Invasive Spine Surgery.

  • 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.