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Saint Francis Orthopedic Institute Surgeons

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Orthopedic Surgeons - Joint Replacement Specialists

Orthopedic surgeons at the Saint Francis Orthopedic Institute 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 Saint Francis Orthopedic Institute. 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 Orthopedic Institute 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, and computer-navigated joint replacement.



 Robert Purchase, MD, is a board certified fellowship trained orthopedic surgeon and the Orthopedic Institute, Medical Director, Shoulder Surgery.  Widely recognized as an expert in complex and revision shoulder arthroplasty, patients travel from all over California to have their shoulder replacement done by Dr. Purchase. He treats all manner of shoulder disease from arthroscopic repair of rotator cuff tears to revision reverse total shoulder replacements.


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.

Orthopedic Surgeons - Spine & Neck Specialists

Spine surgeons focus on the most advanced technologies to treat back pain and spine and neck conditions. Our board certified orthopedic spine surgeons are committed to providing the finest personalized care for all spinal conditions. You can be confident that you will receive top-quality surgical care.


Noel Goldthwaite, MD, is an orthopedic spine surgeon who has been in practice for more than 25 years. He has authored numerous research studies and has given research presentations on spinal fusions, the treatment of neck pain, the lumbar spine, and the impact of surgical decisions on patients.


Clement Jones, MD, is a board certified orthopedic surgeon with more than 16 years of experience performing minimally invasive neck and spine procedures and complex reconstructive spine surgery.



Paul J. Slosar, MD , is a board certified orthopedic surgeon. He has been in practice for more than 20 years and is the Spine Care Institute of San Francisco Medic al Director. His areas of interest include the diagnosis of neck and low back pain with an emphasis on minimally invasive surgical techniques and spinal motion-preservation technologies.

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