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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.
A tear in the anterior cruciate ligament (ACL) is one of the most common knee injuries. An injury to this ligament causes the knee to become unstable and the joint to slide forward too much. ACL tears occur most often in athletes.