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How is the medial collateral ligament (MCL) injured?

The medial collateral ligament (MCL) is injured by a valgus or rotational stress. A valgus stress is a force that pushes the knee in and the lower leg out. A valgus stress is caused by being hit on the outside of the knee. Rotational force will be caused by when the foot is planted and the knee is twisted.

This answer provided for NATA by Loras College.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.