Now the development of medicine is very fast, at the same time, the division of specialties is more detailed, how to improve that, it is common to see the ankle joint given anatomical restoration of internal fixation, the patient feels the ankle joint is unstable, and often appear ankle sprains, diagnosis and treatment is recommended to give symptomatic treatment. The effect is unsatisfactory. Preoperatively, a rupture of the deltoid ligament of the ankle could be diagnosed, 1. The ankle points showed that the medial gap was greater than 5 mm, 2. MRi examination was performed to determine whether the ligament was ruptured or not, 3. Fractures of the anterior malleolus only were present, and a rupture of the posterior ligament of the tibial talar was considered, 4. Skin petechiae and induration pain were present under the medial malleolus. The medial gap was greater than 1mm after fixation was given intraoperatively,and the physical examination was positive for valgus test. Postoperative ankle instability sensation or frequent ankle sprains were present.