1.Postoperative management and rehabilitation skills 1.Emphasize scientific postoperative analgesia, continuous regional block effect is good 2.Practice straight leg raising 45 degrees on the next day after surgery (each down lasts 1-3 seconds, pay attention to induction skills). 3.If there is a drainage tube, it will be clamped open after 4-6 hours and removed within 48 hours, and the wound dressing will be applied with knee flexion as much as possible after the tube is removed; if there is no drainage tube, the pressure dressing will be released at 24 hours as appropriate. 4.Sit on the “tiger stool” during the day after extubation, and sleep on a 15-degree pad with slightly bent knees. 5.Sit on the bedside or bench three times a day, with the lower leg dropping naturally until 〉90 degrees, with the mobile dining seat blocking the patient’s view in the direction of the leg, and the escort slowly pushing the toe to increase the degree of knee flexion. 6, daily straight leg raising until 600 strokes/day (50 strokes/group, 4 groups/time, 3 times/day, 1-2 minutes between each group, alternate exercises if bilateral) 7, 3 days after surgery or as soon as the patient can raise the leg, the patient can be encouraged to stand at the bedside, pay attention to the correct standing posture (eyes level, no buttocks, knee completely straight, if standing against the wall to make the calf “stomach (if standing against the wall, make the lower leg “stomach” touch the wall). 8. After standing firmly, start from stepping in place, gradually take small steps, so that you always do not limp, walk better in front of the mirror, and use a walker for a short time if necessary (without crutches). 9, try not to use CPM (except for patients with very poor compliance, teach patients to use the “chase method”). 10.Give the patient an outline of exercise at home and post it on the bedside. 11. Exercise hard for 3 months and consolidate the exercise for 3 months.