A full or partial tear of the anterior cruciate ligament (ACL) is a common and painful injury that has been estimated to occur approximately 250,000 times annually in the U.S. . Articular cartilage and meniscal injuries are also associated with ACL injuries . ACL injuries can often lead to degenerative osteoarthritis of the articular cartilage . An epidemiology study of athletic injuries by Majewski et al.  determined that out of 19,530 sports injuries, 20% were ACL injuries and 8% were medial collateral ligament (MCL) injuries.
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