Anterior cruciate ligament - Definition

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The anterior cruciate ligament (ACL) is located in the center of the knee. Working in concert with the posterior cruciate ligament, is constitutes what is called the central pivot. It plays an essential role in opposing forward movement, while reducing the risks of excessive rotation of the tibia from the femur. Excessive torsion of the knee is a fairly common cause for a tear in the ACL, in which case surgery is sometimes considered.