ACL is key for stability and movement in the knee. injuries can occur during sport activities, especially with quick direction changes, quick halts, or jumping, including soccer, basketball, and tennis. minor injuries may not cause much a noticeable sound or swelling, but major injuries can cause a loud popping sound and major swelling. women face greater risk than men, because of factors including anatomy, muscle strength, and playing style. Physical therapy and reconstruction surgery are widely used treatments for ACL injuries, with the goal of restoring knee function and strength.