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MCL Sprain An MCL sprain is an injury sustained by the medial collateral ligament (MCL). This ligament is one of the four main ligaments that stabilize the knee joint. It is attached to the bottom of the femur (thighbone), runs down the inside of the knee, over the joint, and attaches at its other end to the top of the tibia (shinbone). Its role is to limit mobility of the knee joint and prevent it from opening up too far when subjected to pressure at the outside of the knee. The MCL is made of tough fibrous connective tissue that, when injured, can be torn, either partially or completely. This is known as an MCL sprain. Although it can be injured in isolation, often the meniscus and ACL are damaged at the same time. Learn More
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