The ACL is the most commonly injured ligament in the knee and often affects younger, active individuals who participate in sports. Injuries to the ACL are usually caused by non-contact rotational forces such as sudden changes in direction, rapid stopping, jumping, and landing abnormally.

The Anterior cruciate ligament (ACL) is one of the key ligaments that act to stabilize the knee joint. The ACL connects your thighbone (femur) to the shin (tibia). Together with the posterior cruciate ligament (PCL), the ACL forms a cross-shaped band that prevents excessive forwards or backward movement of the shinbone relative to the thigh, as well as provides the knee with rotational stability.