Postoperative rehabilitation of arthroscopic combined external ankle ligament repair for ankle osteoarthritis or chronic synovitis 1. On the postoperative day: the patient should rest mainly in bed, while elevating the patient (under the surgical knee and under the calf with pillows), and the affected toe to do dorsiflexion and plantarflexion from time to time. Remember to move only the toes and not the dorsiflexion and plantarflexion of the operated ankle. 2. The first day after surgery: start to move to the ground, still encourage the patient to do dorsiflexion and plantarflexion of the toe. However, the ankle on the operated side cannot be placed on the ground because it is in a cast. The time spent walking on the ground should be controlled. It is generally recommended to walk on the ground 3-4 times a day, and the time spent walking on the ground with the crutches is 5 minutes each time. 3. From the second to the sixth postoperative day, in addition to the activities of the second postoperative day, strengthen the contraction of the quadriceps muscle, relaxation contact and straight leg raising exercises daily. Still no ankle joint activity, toe activity was the main focus. 4.One week to two weeks after surgery: the contraction and relaxation exercises of quadriceps were the same as before, but the ankle joint could not move freely because it was in a cast and had to be fixed. 5.Three weeks to six weeks after surgery: continue to walk with crutches, still in a cast. 6. Seven weeks after surgery, the cast was removed daily and the ankle joint was moved up and down, and the ankle joint was slowly dorsiflexed 0° to 5° and plantarflexed 0° to 5° in the 90° position. The reciprocal movement from plantarflexion 5° to dorsiflexion 5° is one ankle flexion and extension activity, 50 times in a row each time, 3 times a day, 150 times in total. 7. Eight weeks after surgery: the range of dorsiflexion and plantarflexion angles of the ankle joint increased from 5° dorsiflexion to 5° plantarflexion to 10° dorsiflexion to 10° plantarflexion. The weight-bearing of the foot on the operated side can reach 50% of normal. 8. Nine to ten weeks postoperatively: the ankle joint starts to move in a completely normal range of motion in addition to full weight-bearing. There are three ways to practice ankle dorsiflexion and plantarflexion: (1) the patient himself can do the ankle dorsiflexion and plantarflexion by pulling with both hands; (2) the doctor or the patient’s family can help the patient to do the passive dorsiflexion or plantarflexion exercises; (3) the patient can practice the ankle dorsiflexion by squatting and plantarflexion by kneeling on the bed. 9.Three months after surgery: Gradually resume normal functional activities of the ankle joint or walking, however, individual patients may experience swelling of the ankle and back of the foot when they move a lot in the short term after surgery, but it will disappear after rest. 10.Six months after surgery: Generally, the condition of the ankle joint can basically return to normal after six months after surgery. At this time, the swelling of the ankle joint or the swelling of the back of the foot after activity will also slowly disappear.