There are two collateral ligaments of the knee: the medial collateral ligament (MCL) and the lateral collateral ligament (LCL). Injuries of the MCL are much more common, owing to its exposure to damage from a blow to the outside of the knee, creating a so-called valgus force. Collateral ligament injuries can occur in isolation but also commonly occur in association with anterior cruciate ligament (ACL) and/or posterior cruciate ligament (PCL) injuries.
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