An ACL tear is an injury to the anterior cruciate ligament, a key ligament in the knee that helps stabilize the joint. This injury often occurs during sports activities, especially those involving sudden stops, jumps, or changes in direction. Symptoms include pain, swelling, and a feeling of instability in the knee. Treatment for an ACL tear can vary depending on the severity of the injury. Some people may recover with physical therapy and rest, while others might need surgery to repair the ligament. Rehabilitation is essential for restoring strength and mobility, allowing individuals to return to their favorite activities safely.