Lateral collateral ligament (LCL) injury of the knee can be caused by a varus stress, twisting of the knee when weight-bearing or repeated stress of LCL. Along with the LCL, PCL, ACL, injuries are possible.
The LCL is a strong connection between the lateral epicondyle of the femur (thigh bone) and the head of the fibula. It prevents various stress on the knee and tibial external rotation and thus a stabilizer of the knee.
It is usually associated with the dislocation of knee joint.