Our Team

John G. Costouros, MD

John G. Costouros, MD

Dr. Costouros specializes in the arthroscopic and open treatment of shoulder and elbow disorders derived from sports injuries, arthritis, fractures, compressive neuropathies, and failed prior surgeries.   He is board-certified by the American Board of Orthopaedic Surgery.  He is a native of the Silicon Valley, having attended Bellarmine College Preparatory in San Jose.  Dr. Costouros is educated and trained at Stanford University, the University of California, San Francisco (UCSF), and Harvard. 

He graduated from Stanford University with honors in Biological Sciences in 1994 followed by medical school and residency in orthopaedic surgery at the University of California, San Francisco (UCSF).  During Stanford and UCSF, Dr. Costouros made significant award-winning research discoveries in the molecular etiology and treatment of arthritis and cartilage injuries.

Following UCSF, Dr. Costouros completed fellowships in shoulder and elbow reconstruction, arthroscopy, and sports medicine at Harvard Medical School and the Massachusetts General Hospital as well as the University of Zürich.  This allowed him to train under two of the world’s most renowned academic surgeons, J.P. Warner and Christian Gerber as well as gain a unique international perspective in the comprehensive treatment of complex shoulder and elbow disorders. Dr. Costouros was recruited to join the Stanford faculty in 2011 after establishing a busy regional referral practice as chief of shoulder and elbow surgery for The Permanente Medical Group which attracted patients from the entire San Francisco Bay Area and receiving multiple awards for clinical excellence.

Dr. Costouros is actively involved in the training of orthpaedic surgeon training at national and international skills courses.  He is frequently invited by the American Academy of Orthopaedic Surgeons and the Arthroscopy Association of North America to lead technical skills workshops on shoulder arthroscopy and joint replacement. 

He has made several significant contributions in his field which have been published in numerous peer-reviewed medical journals and textbooks.  He has over forty publications consisting of articles in peer-reviewed journals, book chapters, and abstracts at national and international scientific meetings.  He has special expertise in the reverse total shoulder replacement, management of massive and irreparable rotator cuff tears, revision surgery, tendon transfers, fractures of the shoulder girdle, and the treatment of sports-related disorders and instability of the shoulder in overhead athletes using arthroscopic techniques.

His research focuses on improving our understanding of cartilage injury and arthritis at the cellular level, specifically the development of methods to modulate programmed cell death or apoptosis.  He also is involved in the development of cell-based strategies in improving outcomes following rotator cuff repair and better understanding the causes of rotator cuff disease.  Dr. Costouros continues to be interested in the development of instruments to analyze surgical outcomes and the creation of registries which allow surgeons to better understand patient-specific outcomes, implant longevity, wear mechanisms, and how surgeons can consistently deliver the best results following surgery. 

Dr. Costouros is active in medical volunteerism worldwide as a member of Orthopaedics Overseas and has traveled to perform orthopaedic surgery for the underserved in several countries in Africa, Asia, Central and South America.   He provided orthopaedic surgical care to the athletes of the 2004 Summer Olympic Games.  He is on the Board of Directors of the Northern California Chapter of the Western Orthopaedic Association (NCCWOA) and the Leroy C. Abbott Orthopaedic Society.  He continues to be very involved with medical education and has been the Program Chair for multiple local and statewide CME-accredited conferences.


Emilie Cheung, MD

Emilie Cheung, MD

Dr. Cheung has been a member of the Stanford Orthopedic Surgery Department since 2006.  She graduated from New York Medical College in 2000.  She completed her Orthopedic Surgery Residency in 2005 at Drexel University in Philadelphia.  Her fellowship in Shoulder and Elbow Surgery was completed in 2006 at the Mayo Clinic in Rochester, MN.  She became a Board Certified in Orthopedic Surgeon in 2008. 

Dr. Cheung specializes in surgery related to the shoulder and elbow, including fractures, joint replacements, rotator cuff repair, ligament repair, sports injuries and all arthroscopic procedures.

She is Chief of the Shoulder and Elbow Service at Stanford. She is a Board-certified orthopedic surgeon, a Fellow of the American Academy of Orthopedic Surgery, Member of the prestigious American Shoulder Elbow Society, Member of the Association of Clinical Elbow and Shoulder Surgeons, Member of the Mayo Elbow Club, and a Board Member of the Northern California Orthopedic Society. 

Her research has focused on clinical outcomes following revision of total shoulder replacements, revision of total elbow replacements, and treatment of complications following shoulder and elbow reconstruction procedures. Her publications include those in the Journal of Bone and Joint Surgery, Journal of Shoulder and Elbow Surgery, Journal of the American Academy of Orthopedic Surgeons, and Clinical Orthopedics and Related Research. She has presented her work and often lectures at regional and national orthpaedic surgery conferences, and has written numberous textbook chapters in the field of shoulder and elbow reconstruction. Her current research topics include localized bone mineral density in the shoulder after arthroplasty and 3-dimensional kinematic study of the shoulder girdle.


Megan Stiehr, PA

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