Muscles that are not practiced for more than four weeks are likely to produce significant degeneration, and it has been observed clinically that for patients who require long-term braking, muscle degeneration may occur to a greater or lesser extent once more than about four weeks have elapsed. As a result of the process of long-term braking or not exercising, resulting in the muscle not getting sufficient external stimulation, at this time will make it gradually produce disuse muscle atrophy, this situation is applicable to patients who have long-term braking and long-term non-exercise. If the patient does not exercise the muscle for a long time, it will gradually degenerate, and the patient can be made to actively do relevant functional exercises to prevent the muscle degeneration from accelerating. Although the patient takes external fixation, you can do functional exercises specially designed by the doctor for the patient to gradually subject the muscle here to the corresponding external stimulation and slow down the degeneration rate.