Typically, after an ACL injury, try not to bend the leg to avoid aggravating the injury and compromising recovery. The ACL is the main ligament that maintains the stability of the knee, allowing the knee to bend and extend. Its main function is to provide stability in the anterior-posterior direction of the knee and to prevent the knee from moving too far forward. ACL injuries often occur during sporting activities and can present with swelling, pain, and symptoms of knee instability. The knee is a very complex and important joint that requires precise treatment. Treatment for ACL injuries mainly consists of physical therapy such as rest, localized ice, knee compression and elevation. If there is a tear in the ligament, arthroscopic surgery is usually required for ligament reconstruction. ACL injuries should be treated promptly with regular therapy, and recovery exercises should be performed after surgery as recommended by your doctor.