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Anterior cruciate ligament (ACL)

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Anterior cruciate ligament (ACL)

The anterior cruciate ligament (ACL) is one of four knee ligaments that connect the thighbone (femur) and shinbone (tibia) and help keep the knee stable. The ACL is inside the knee joint. It helps control rotation and helps keep the tibia from sliding too far forward.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

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This information does not replace the advice of a doctor. WebMD Ignite, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.