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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.
A knee sprain is an injury to the ligaments in the knee, which are the tough, elastic-like bands in the knee that connect your bones together and hold your joints in place. A sprain can effect many of the ligaments in your knee by tearing the fibers of the tissues, which usually causes pain, swelling, and bruising.