New Physician Joining OSI in January 2018

Gerald Alexander, M.D

Dr. Alexander is a board certified orthopaedic spine surgeon specializing in microsurgery and minimally invasive spine surgery.

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New Physicians Joining OSI in September 2017

Asif Jillani, M.D.

Dr. Asif Jillani is board certified in Physical Medicine and Rehabilitation and Pain Medicine

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Adam Rivadeneyra, M.D.

Dr. Riva is a Board Certified Primary Care Sports Medicine physician with a background in Family Medicine specializing in non-surgical Orthopaedics and Sports Medicine

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Welcome to Orthopaedic Specialty Institute

Orthopaedic Specialty Institute is one of Southern California’s premier orthopaedic medical groups located in Orange County, California.

OSI offers a broad line of professional orthopedic services including Spine Surgery, Total Joint Replacement, Sports Medicine, Foot and Ankle, Hand and Upper Extremity and General Orthopedics. In addition to the physician's clinic, the center offers physical and hand therapy as well as digital X-ray and MRI.

Research Foundation of Southern California

The Orthopaedic Education and Research Foundation of Southern California (or OSI Foundation) is dedicated to providing educational forums to the public, allied health providers and physicians..

Click the desired topics below to find out more

More educational videos from

Anterior Hip

Direct Total Anterior Hip Replacement by Dr Steven Barnett from CCJR meeting in Las Vegas

Latest News

  • Orthopaedic Specialty Institute expands to new Irvine Office

    Orthopaedic Specialty Institute is excited to announce our new Irvine Office. The new office is located conveniently next to Hoag Orthopedic Institute, at 16300 Sand Canyon Ave, Suite 500, Irvine, CA 92618. Please visit our new location as we hope to bring high quality orthopedics care closer to you. Call (714) 634-4567 for an appointment.

  • Orthopaedic Specialty Institute welcomes new doctors to our group:

    Dr. Adam Rivadeneyra (Orthopaedic Surgeon)
    Dr. Asif Jillani (Physical Medicine and Rehabilitation)


The Cleveland Clinic announced that they and five additional orthopedic centers of excellence across the nation will begin to contract directly with employers to provide superior orthopedic care at bundled rates for hip, knee and spine surgeries. This new orthopedic venture will be known as the National Orthopedic & Spine Alliance.

Hoag Orthopedic InstituteSuperior Orthopaedics