Anterior Cruciate Ligament (ACL)

The anterior cruciate ligament (ACL) is one of four knee ligaments that connect the upper leg bone (femur) with the lower leg bone (tibia) by running crosswise inside the center of the knee joint. The ACL stabilizes knee movement in a forward and backward direction. Specifically, the ACL prevents the tibia from sliding…

Anterior Cruciate Ligament (ACL)

The anterior cruciate ligament (ACL) is one of four knee ligaments that connect the upper leg bone (femur) with the lower leg bone (tibia) by running crosswise inside the center of the knee joint. The ACL stabilizes knee movement in a forward and backward direction.

Specifically, the ACL prevents the tibia from sliding or twisting abnormally on the femur when the leg is straight or slightly bent. And the ACL prevents the knee from being stretched or straightened beyond its normal limits (hyperextended). It also supports other knee ligaments that keep the knee from bending sideways.

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Anterior Cruciate Ligament (ACL)

The anterior cruciate ligament (ACL) can be seen in this front view of the left knee joint. The ACL links the upper leg bone (femur) with one of the lower leg bones (tibia) by running crosswise inside the center of the knee joint. The ACL helps stabilize the knee.

Anterior Cruciate Ligament (ACL)

Picture of the anterior cruciate ligament (ACL)

The anterior cruciate ligament (ACL) can be seen in this front view of the left knee joint.

The ACL links the upper leg bone (femur) with one of the lower leg bones (tibia) by running crosswise inside the center of the knee joint. The ACL helps stabilize the knee.

Current as ofJune 26, 2019

Author: Healthwise Staff
William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Adam Husney, MD - Family Medicine
Kathleen Romito, MD - Family Medicine

This information does not replace the advice of a doctor. Healthwise, Incorporated, 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.