Functional exercise after tibial plateau collapse varies tremendously in training content in different time periods. It mainly includes muscle strength training, joint mobility training, patellar release training, weight-bearing training and so on. 1. On the day of surgery: ankle pump exercises, quadriceps and hamstring isometric contraction exercises, as much as possible without increasing pain. 2. 1~7 days after surgery: If the pain is not obvious, you can start straight leg raising exercises to avoid rapid atrophy of the leg muscles; if the pain is obvious, you can postpone it for a few days. Including straight leg raising exercises, side leg raising exercises, leg raising exercises. 3. 1~3 weeks after operation: start knee flexion training operated by professional doctor, start from no or slight pain range, gradually increase the angle, and start icing immediately after the exercise; patellar luxation: for patients with poor patellar mobility, start to push the edge of the patella with the belly of the finger or the root of the palm after removing the stitches, and push the patella slowly and forcefully in the direction of upward, downward, leftward, and rightward, which can be carried out before flexion exercise. 4. 4~6 weeks after surgery: knee extension exercises, stretching exercises in the muscles and the posterior joint capsule of the tugging feeling and slight pain is normal, not to contract the muscles to fight, should be completely relaxed. 5. 6~12 weeks after surgery: start weight-bearing exercises, from 1/4→1/3→1/2→2/3→4/5→100% of body weight. In addition, anterior-posterior and lateral stepping exercises, heel lifting exercises, static squatting exercises, single-leg squatting exercises on the affected side, downward exercises in front of the step, plyometric exercises, etc. can be performed. Functional exercises after tibial plateau collapse must be carried out under the guidance of the doctor to avoid secondary injury.