Lateral collateral ligament injury

The lateral collateral ligament (LCL) is a band shaped structure which runs from the outer surface of the thigh bone (femur) to the head of the smaller bone in the lower leg (fibula). It restrains the knee from opening up on the outer side. Injuries to the LCL are caused when the knee is forced into a bow-legged position by a blow to the inner side of the knee. LCL injuries can range from simple sprains through to complete ruptures.

Sprains are best treated with early movement supervised by a physiotherapist while protecting the ligament from any further injury with a brace. Complete ruptures often require surgery to repair or even reconstruct the ligament.