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Knee injury is one of the most common reasons people see their doctors. Your knee is a complex joint with many components, making it vulnerable to a variety of injuries. Many knee injuries can be successfully treated with simple measures, such as bracing and rehabilitation exercises.
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.