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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.
Although there are several causes for knee instability and pain, joint injury and osteoarthritis of the knee are two of the most common reasons for a knee to lock up and give out. Your knees have four main ligaments that stabilize the patella, or knee cap and join the thigh and shin bones together.