A patellar dislocation should be followed by a manipulative repositioning with external fixation in a brace or cast for a month to a month and a half of protection. Only after all these treatments have been completed does it involve functional rehabilitation exercises. At the beginning, it is for example sitting on the edge of the bed to let the lower leg descend slowly, the whole knee joint range of motion gradually increases to 90 degrees, and then exercise to keep the lower leg raised, which can also exercise the muscles of the thigh. In this case you can lie on the bed and lift the leg up, trying to keep the calf against the thigh, the whole knee range of motion is basically restored, and at this time there is no knee weight-bearing exercise. These are completed, you can slowly exercise squatting with weights these knee range of motion exercise. A principle of the whole is to gradually increase the angle to restore the range of motion of the joint and the muscle strength around the knee joint.