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Total Joint Center Surgeons

Joint Replacement Experts

Orthopedic surgeons at the Saint Francis Memorial Hospital Total Joint Center are experts in the field of orthopedic surgery and joint replacement surgery. Saint Francis orthopedic surgeons deliver top-quality joint care, including some of the latest surgical techniques such as anterior approach hip replacement surgery, and robotic partial knee replacement surgery.


Nicholas Mast, MD, is the Medical Director of the Total Joint Center at Saint Francis Memorial Hospital. Board certified in orthopedic surgery, he specializes in anterior approach total hip replacement, a procedure that involves making a small incision at the front of the hip, rather than in back. With this technique, patients find that their mobility is restored sooner and their recovery time is shorter than with traditional hip replacement surgeries.



Victor Prieto, MD, is an orthopedic surgeon who has been in practice for more than 20 years. He is physician member of the Saint Francis Memorial Hospital’s Total Joint Center and the medical director for the Center for Sports Medicine. He specializes in hip/knee replacements, and shoulder surgery. His expertise includes mini-incision hip replacement, Mumford procedure, knee arthroscopy, uni-compartment and robotic-assisted knee replacement, ande computer-navigated joint replacement.

Dominic Tse, MD, specializes in computer-navigated total ip replacement and total knee replacement. His focus is on minimally invasive surgery and quad-sparing total knee replacement. 



John Velyvis, MD, is board certified in orthopedic surgery and specializes in minimally invasive knee and hip surgery. He is an expert in the use of robotic-assisted partial knee resurfacing. Robotic Assisted Partial Knee Resurfacing is a new discipline in the treatment of arthritic knee joints and Dr. Velyvis has emerged as one of the leaders in the field.

Total Joint Center Team of Health Professionals

This comprehensive team of health professionals work together to provide you with top-quality medical and surgical care at the Total Joint Center.

an orthopedic surgeon wishing to pursue advanced training in a technique or area of interest. The fellow is under direct supervision of the treating physician, and may assist in examinations, in-hospital care, surgery, and research.

Anestheiologists: Performs all anesthesia procedures. 

Hospital Staff Nurse: Attends to your daily needs and dispenses medication while in-hospital.

Physician Assistant (PA): Conducts patient and family contact prior to surgery, assists in in-hospital care, surgery and is readily available to answer questions about medications, rehabilitation, or concerns around the time of surgery.

Physical Therapist: Works with you to regain joint motion and muscle strength and helps you to ambulate with or without assistive devices (crutches, walker, cane, wheelchair).

Hospitalists: Internal Medicine specialists who perform complete medical evaluations around the time of surgery. They participate in in-hospital management of medications, fluids, antibiotics, pain management, and blood thinners.

Office Manager: Office administration, may answer questions about Total Joint Center billing and administrative issues.

Surgery Scheduler/Authorizations: Facilitates the authorization and scheduling of your surgery.

Medical Assistant: Facilitates scheduling of radiographs and procedures. Assists in the completion of forms and disability paperwork.

Financial Counselor: Can provide financial arrangements and information regarding cost of hospital stay and insurance coverage. They can be reached at 415-353-6140.

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Saint Francis Memorial Hospital
900 Hyde St
San Francisco, CA 94109
(415) 353-6000