The ACL connects the thigh bone to the shin bone in the knee and is important in stabilising the knee during activity. An injury to the ACL often renders the knee untrustworthy and causes feelings of “giving way” or “collapsing” during sports. A torn ACL is one of the most common knee injuries, particularly in sports that include pivoting, jumping, or sudden change in direction such as basketball, soccer, or football. Many patients benefit from surgical reconstruction of a torn ligament, particularly where it occurs in conjunction with other ligament or meniscus injury.