I. Initial stage (0~7 days) 1, the day of surgery: after anesthesia subsides, start to move the toes and ankle joints; try to carry out isometric contraction exercises for quadriceps muscles. 2, the first postoperative day: (after indwelling urinary catheterization and removal of drainage tubes) can be used on crutches, the affected limbs are not weight-bearing (not sticky ground) to walk on the ground, and the affected limbs will feel heavy and swollen, which is normal. Supine straight leg raising exercises (support lock straight) 10 times / group, 2 groups / day ankle pump exercise 300 ~ 500 times / day (some patients began to straight leg raising exercises can not be raised is a normal phenomenon, do not interrupt the attempt to lift the exercise) 3, 3 days to 7 days after surgery: lower limb walking exercises: repeat the above 2 content, the affected limb can gradually weight-bearing, with the support of the crutches on the ground, crutches time distance from a small number of to a large number of (support must be brought well, keep straight) Joint mobility exercises: no flexion and extension exercises for one week after surgery, start knee flexion and extension exercises on the 7th day (once a day, each time there should be progress, avoid repeated no progress), knee flexion exercises in the morning, knee extension exercises in the afternoon. Flexion and extension exercises in the morning and extension exercises in the afternoon. Flexion and extension exercises should reach 90~100 degrees in 2 weeks after surgery. Early stage (8 days~4 weeks) 1, lower limb muscle strength exercises: supine straight leg raising exercises 10 times/group, 4 groups/day, walking on crutches (if swelling is heavy, walking can be reduced as appropriate) time and distance from less to more. 2, joint mobility exercises: sitting leg drop exercises (or sitting top flexion exercises), 4 weeks when the flexion angle should reach 100 degrees. 3. Remove the stitches 14 days after surgery. 4. Abandon the crutches 5 weeks after surgery, and do not support the crutches for one and a half months. Third, the middle period (5 weeks ~ 3 months) 1, lower limb muscle strength exercises: supine straight leg raising exercises 10 times / group, 4 groups / day, walking without assistance. Three months after surgery, start squatting against the wall, 1~5 minutes/times, 5~10 times/group, 10 seconds interval to do the next group, 2 groups/day 2, joint mobility exercises: seated leg drop exercises (or seated top flexion exercises), the flexion angle should be up to 120 degrees at 6 weeks. Fourth, later (4 months ~ 12 months) 1, small jump, sidewalk, backward, jogging, swimming (prohibit breaststroke, and due to occasional leg muscle spasms, avoid deep water); 2, flexibility training and skills training, such as side walk slope; 3, 6 months knee range of motion should be greater than 130 °, can resume non-physical contact sports activities, continue to train 2 to 3 times a week. 4.After 12 months, the thigh circumference is restored to more than 95%, and competitive, confrontational, and physical contact sports activities are resumed.