Medial Collateral Ligament (MCL) Injury: Symptoms & Signs

A medial collateral ligament (MCL) injury is damage to one of the four ligaments that help stabilize the knee joint. The MCL is located on the inside of the knee. Most MCL injuries are sprains or tears of the ligament.

Signs and symptoms of medial collateral ligament injury include pain on the inside of the knee, tenderness of the knee area, swelling, difficulty walking, knee stiffness, and locking of knee joint. Other associated symptoms can include instability of the knee joint.

Causes of medial collateral ligament (MCL) injury

A direct blow to the knee or a sudden deceleration or stop in movement usually causes these injuries. Contact sports like hockey, football, wrestling, and martial arts may cause an MCL injury.

Other medial collateral ligament injury symptoms


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Medically Reviewed on 9/10/2019
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.