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American Academy of Family Physicians.
American Academy of Orthopedic Surgeons.
Community Health Care Medical Library.
Jonathan Cluett, M.D, "About.com," Orthopedic Surgery Fellow in Sports Medicine and Arthroscopy, California.
Milton S. Hershey Medical Center College of Medicine.
National Health Services (NHS) Direct.
National Institute of Arthritis and Musculoskeletal and Skin Diseases web site.
National Institutes of Health.
University of California, Davis, Student Health Services web site.
Reviewed by Stephanie S. Gardner, MD on May 05, 2019
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