The medial collateral ligament of the knee is one of the four major ligaments of the knee. It is on the medial (inner) side of the knee joint in humans and other primates. It is also known as the tibial collateral ligament, or abbreviated as the MCL.
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An MCL injury can be very painful and is often caused when the knee bends the wrong way when landing, or on high impact. It can take between 2 and 10 weeks for the injury to fully heal. It is difficult to apply pressure on the injured leg for at least a few days.