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The knee is considered one of the most complex joints in the human body. Because so many sports apply stress to on the knee, the knee is one of the most commonly injured joint. The knee is considered a hinge joint, but because the rotation of the tibia is an essential part of knee movement, the knee is not a true hinge joint. The stability of the knee joint depends primarily on the ligaments, the joint capsul and the muscles that surround the joint. In this report i will concentrate on one of the ligamants, the MCL, or the Medial Collateral Ligament. Injury occurs as a result from a medial directed force from the lateral side, or from an external rotation of the tibia. Tears resulting from rotation combined with side stress with the foot fixed result in an ACl and occaionally PCl tears. More significant injuries occur with medial sprains than from lateral sprains because increased potential of injury to the joint capsule and medial meniscus. Many mild-to-moderate sprains leave the knee unstable and vulnderable to additional internal derangements. Because the medial collateral ligament attaches above the joint line of the medial condyle of the femur and