School of Medicine


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  • Zackary Vaughn, MD

    Zackary Vaughn, MD

    Clinical Assistant Professor, Orthopaedic Surgery

    Current Research and Scholarly Interests Hip Arthroscopy in the Treatment of Femoroacetabular Impingement and Labral Tears
    Anterior Cruciate Ligament Reconstruction and Revision Techniques

  • Stephen R. Viess, MD

    Stephen R. Viess, MD

    Clinical Assistant Professor, Orthopaedic Surgery

    Bio Dr. Viess is a board-certified orthopaedic surgeon with subspecialty board certification in sports medicine. He delivers care at Stanford Health Care ? ValleyCare in Pleasanton.

    Dr. Viess focuses on arthroscopic surgery and sports medicine and fracture care, with a special interest is arthroscopic reconstruction of the shoulder and knee. He strives to offer his patients the least invasive surgical procedures, including all-inside ACL reconstruction and arthroscopic rotator cuff repairs.

    For six years, Dr. Viess directed the Stanford Health Care ? ValleyCare Sports Medicine Program. He served as Assistant Team Physician for Major League Baseball?s Oakland As, providing game coverage and conducting pre- and post-season physical exams. He also served as the team physician for Granada High School in Livermore, California.

    In addition to his clinical practice, Dr. Viess has conducted research, including a 10-year review of clinical satisfaction, revision rates, and radiographic evidence of stem fixation associated with the Ultimate-C femoral stem. He also led a study evaluating capsular sling repair during total hip arthroplasty.

    Dr. Viess has made numerous presentations to peers and to the community. Peer-targeted topics include graft selection in ACL reconstruction, concussion management, on-field management of spine injuries, and more. At the Lake Tahoe Sports Medicine Conference, he has presented lectures on PCL ruptures, multi-ligament knee injuries, and AC joint sprains. He also has delivered lectures for family practitioners on the evaluation and physical examination of orthopedic patients.

    For the community, Dr. Viess has made presentations at health fairs and schools. Topics include the biomechanics of pitching, and shoulder and elbow injuries in the throwing athlete.

    Dr. Viess is a fellow of the American Academy of Orthopaedic Surgery and a member of the California Orthopaedic Association.

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