Daily causes of ligament laxity are many, the most common causes are considered to be chronic strain, trauma, and degeneration of ligament parts, as follows: a. Chronic strain: chronic strain of ligament parts for a long time, after a long time of local excessive force activities, it will lead to ligament laxity. Second, trauma: especially after the ligament part of the external injury, will lead to ligament tear or complete rupture, thus causing ligament laxity. Degeneration of the ligament: after the degeneration of the ligament, it will also lead to the laxity of the ligament. After the ligament laxity occurs, the patient must actively investigate the body, according to the cause of ligament laxity, the severity of ligament laxity, so as to determine the corresponding treatment plan.