The joints of human limbs, such as the elbow joint, are fine for a week if they are inactive, but if the elbow joint is immobilized for more than three weeks, the problem brought about is stiffness of the joint. Why does joint stiffness occur? In fact, it is a protective reaction of the body. In fact, there are many cavities in the joint, and if the joint is not moved, the problem is that a lot of scar tissue grows into the cavity, and when it fills up, the scar tissue blocks the movement of the joint, and then it becomes stiff. In addition, when we cook at home, we can see that there is a very smooth layer on the surface of the cut beef, which is the muscle fiber of the muscle, and it is very smooth inside. If the patient after fracture does not move or has certain injury, such as strain or contusion of muscle or tendon, the local tissue will have (sterile inflammation) exudation, and local adhesions will occur after the exudate is absorbed, and once the adhesions are made, the muscle will not be as smooth as the fresh beef we cut, and the position between the muscle fibers will slide, and the adhesions at this time will restrict the movement of the joint. In short, I can tell you clearly: the sooner you can exercise the limbs, the better, if you wait until a month later, the exercise is too late.