Immediately postoperative to 2 weeks postoperative Control of swelling and infection (cold compresses, topical fotarine cream and antibiotics). Passive full extension of the knee immediately after surgery. Gradual restoration of knee flexion (1st week to 80°; 2nd week to 90°). Autonomous isometric contraction of the quadriceps. Move the patella. Wear a brace (in the extended position) when walking down to 1/2 weight. 3 to 6 weeks postoperatively Control edema (cold compresses, fotarine cream, straight leg raising exercises). Keep the knee straight and gradually return to knee flexion (week 3: 120°; week 4: 135°; week 5 145°, week 6 155°). Weight-bearing exercises and body posture training (sitting, standing and walking exercises in normal posture), starting from 1/2 to 2/3 body weight at 4 weeks. At 4 weeks, the patient will begin striding exercises: the patient will stand on the ground with both feet, the affected knee will be flexed 30 degrees and supported by the affected leg, the healthy leg will stride forward, and then the healthy leg will be retracted. This is repeated to practice the neuromuscular control and stability control of the affected limb. 6 to 12 weeks after surgery (1) Muscle strength exercises. (2) Start normal weight-bearing. (3) Step exercises: Prepare a small low stool, stand with both feet on the stool, bend the affected knee, and at the same time, leave the stool from the side of the healthy limb to touch the ground, and then return to standing on the stool by straightening the healthy knee after the healthy limb touches the ground. This is repeated mainly to practice the strength of the affected limb and to practice control of the knee stability. If you want to increase the difficulty of the exercise, you can increase the height of the low stool.