The LCL runs from the lateral femoral epicondyle to the fibular head, providing the primary restraint against varus forces and contributing to posterolateral rotatory stability.
Resists varus stress and prevents the lateral side of the knee from opening — critical during stance phase of gait.
LCL injuries are less common than MCL injuries. Severe varus trauma produces posterolateral corner injuries requiring surgical reconstruction.
Varus impact or hyperextension injury producing lateral knee pain, fibular head tenderness, and instability on varus stress testing.
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