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Knowledge center. The knee is a complex structure and one of the most stressed joints in the body. It is the largest joint, vital for movement, and vulnerable to injury. The knee is the most commonly injured joint by adolescent athletes with an estimated 2.5 million sports-related injuries annually. Many knee injuries can be successfully treated with simple measures, such as bracing and strengthening exercises. Other injuries may require surgery to correct.
There are four ligaments in the knee that are prone to injury: Anterior cruciate ligament (ACL) is the most commonly injured knee ligament. It connects the thigh bone to the shin bone. Posterior cruciate ligament (PCL) also links the thigh bone to the shin bone in the knee. (Itâs rarely injured except in car accidents).