Rehabilitation training after patellar fracture is related to the recovery time, with muscle isometric contraction training in the early stage and joint mobility, weight bearing and walking training in the later stage. 1. 1~2 days after surgery: ankle pump training can be started after awake from anesthesia (the affected side of the ankle actively tense the dorsum of the foot with force, hook the toes upward, and the cycle is repeated), isometric training of quadriceps and hamstrings (tense the anterior and posterior thigh muscles with force, but do not cause the knee joint to move). After removing the drainage strip, you can walk on the ground with the assistance of the therapist, and perform lateral and posterior leg raising exercises, weight-bearing and balance training. 2. 1 week after the operation: start the knee flexion and extension exercises, gradually transitioning from completing the flexion and extension exercises with the assistance of the therapist to completing them on your own initiative, and gradually increasing the angle of flexion. 3. 6 weeks~3 months after surgery: With the increase of knee flexion angle, you can start to hold the knee with both hands and hook the leg and other exercises. 4. 3 months after surgery: depending on the fracture healing, increase the difficulty and intensity of training. For example, supine stretching training, standing balance training, up and down steps, etc. Postoperative rehabilitation training for patella fracture must be carried out under the guidance of a professional doctor, do not train blindly to avoid adverse consequences.