The ACL or anterior cruciate ligament is one of four key knee ligaments. The ACL attaches the tibia to the femur, keeping the shin bone in place, and is critically important to knee movement and stability. An ACL strain or tear is one of the most common knee injuries and individuals who have suffered an ACL injury often complain that their knee "gives out" or buckles as the joint's overall stability has been compromised. While there are many, many ways to tears