How do I know if I have injured my anterior cruciate ligament (ACL)?

An ACL (anterior cruciate ligament) sprain is characterized by a pop associated with feeling the knee joint slide followed by inability to walk normally, swelling of the knee joint, fluid buildup around the knee, difficulty straightening the knee, pain in the back of the knee, and the knee feeling unstable.

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.