ACL is key for stability and movement in the knee. Injuries often occur during athletic play, especially with rapid changes of direction, abrupt stops, or leaps, like soccer, basketball, and tennis. minor injuries may not produce much swelling or sound, but serious injuries may cause a loud popping sound and major swelling. women are at higher risk than the men, linked to anatomy, muscle strength, and playing style. Physical therapy and reconstruction surgery are common treatments for ACL injuries, to restore knee function and strength.