Where is the MCL located and what movement does it mainly stabilize?

Where is the MCL located and what movement does it mainly stabilize?

• A. Lateral side; prevents varus movement.
• B. Posterior aspect; prevents hyperflexion.
• C. Anterior aspect; prevents hyperextension.
• D. Medial side; prevents valgus.

Answer: (D)

The MCL is the ligament on the inner (medial) side of the knee, running from the medial femoral epicondyle to the medial tibial condyle. Its main job is to resist valgus forces—those that push the knee inward and open the medial joint space. In practical terms, it helps keep the knee stable when a force comes from the outside of the knee, preventing excessive medial gapping. It isn’t primarily responsible for preventing hyperextension or for resisting forces from the posterior aspect, which involve other structures. So locating the MCL on the medial side and recognizing its role in preventing valgus movement best fits how this ligament stabilizes the knee.

The MCL is the ligament on the inner (medial) side of the knee, running from the medial femoral epicondyle to the medial tibial condyle. Its main job is to resist valgus forces—those that push the knee inward and open the medial joint space. In practical terms, it helps keep the knee stable when a force comes from the outside of the knee, preventing excessive medial gapping. It isn’t primarily responsible for preventing hyperextension or for resisting forces from the posterior aspect, which involve other structures. So locating the MCL on the medial side and recognizing its role in preventing valgus movement best fits how this ligament stabilizes the knee.