1. Start to move the toes and ankle in bed on the day after surgery, with the heel pads elevated (the back of the knee joint is vacant); 2. Adjust the brace, starting from 0°, and increasing the flexion by 5° every day, reaching 90° of flexion by the end of 2 weeks (just try to improve the angle each time, avoid repeated flexion and extension and multiple exercises); 3. 4.Lock the brace in the fully extended position during sleep. 2~4 weeks 1.The range of flexion reaches 120° at the end of the fourth week; 2.Partial weight-bearing squatting and brisk walking; 3.Complete weight-bearing with abduction and no pain when the affected limb is unilaterally weight-bearing before abduction. 4～8 weeks 1.Walking off the crutches (carry the brace, unlock the brace); 2.Squatting against the wall; 3.Lateral and front-back striding. 9～12 weeks 1.Prolonged walking (with functional brace), variable speed walking or running; 2.Progressive increase of knee range of motion to 135° or greater (individual differences) 3.Up and down step training 4.Functional individual training (trotting, swimming…) Outpatient review in three months, MRI of knee 12～18 weeks 1.Continuous exercises Quadriceps and N cord muscle strength; 2.Squatting weight transfer; 3.Specialized movement ability training; 4.Sensitivity (small jump, side walk, backward walk…) 5 ~ 6 months Flexibility training and skill training, such as walking 8 words 6 months 1, at this time the range of motion should be greater than 130 °, the muscle strength of the posterior thigh muscle is greater than 90%, the muscle strength of the anterior thigh muscle is greater than 85% 2, can resume non-physical contact sports activities, continue training 2 to 3 times a week. 12 months Competitive, confrontational, physical contact sporting events.