An anterior cruciate ligament (ACL) tear, an injury of the knee, can be devastating to a young athlete. While the ACL can be reconstructed through surgery, there is a high risk of re-injury in patients under the age of 25. In the largest clinical trial of its kind, researchers have shown that performing an additional surgical procedure called lateral extra-articular tenodesis (LET) may reduce the risk of ACL re-injury in young athletes.