MCL/LCL Injury

Sprains of the medial and lateral collateral ligaments (MCL and LCL) are common knee injuries.

The MCL is a ligament that runs along the inside of your knee joint. It connects your thighbone (femur) to your shinbone (tibia).

The LCL is a ligament that connects the thighbone and calf bone on the outside of your knee (fibula).

Causes and Risk Factors

Playing contact sports, such as football or soccer, increases your risk of an MCL or LCL sprain.