Anterior cruciate ligament plays a crucial role for stability and movement in the knee. injuries frequently happen during sport activities, especially with rapid changes of direction, sudden stops, or leaps, like soccer, basketball, and tennis. minor injuries may not cause much swelling or sound, but serious injuries may cause a loud popping sound and significant swelling. women are at higher risk than the men, due to factors like anatomy, muscle strength, and playing style. rehabilitation and reconstruction surgery are widely used treatments for ACL injuries, to restore knee function and strength.