The plaster can be applied below the outside of the knee after an ACL injury. The anterior cruciate ligament is not a separate bundle, but a fan-like unfolding, when the anterior cruciate ligament injury occurs in strenuous exercise, it is easy to produce knee joint swelling and pain. If the injury is mild, it can be treated conservatively by applying plasters on the outer lower part of the knee joint, or by applying appropriate heat massage to the local area. Some patients with anterior cruciate ligament injury is more obvious, and even affect the late dysfunction, at this time the patient needs to go to the hospital in time for examination, such as anterior cruciate ligament tear, but also through the arthroscopic surgical method for treatment. After ACL injury, patients need to avoid strenuous physical exercise. If there is any discomfort, consult a doctor in time, and cooperate with sports rehabilitation methods during the recovery process, so as to avoid dysfunction.