An ACL tear is a common knee injury that occurs when the anterior cruciate ligament, one of the major ligaments in the knee, is stretched or torn. It often happens during activities that involve sudden stops, changes in direction, or direct impact to the knee. ACL tears can cause pain, swelling, instability, and difficulty with movement. Treatment may include rest, physical therapy, bracing, and surgery in some cases. Recovery time can vary depending on the severity of the tear and the individua