Whether the broken arm can be restored to normal is related to the severity of damage and recovery; patients with less important tissue damage and better postoperative recovery can usually regain normal function; if the damage is more serious and the postoperative care is not good, the normal function of the arm may be affected. 1. Can return to normal: Sharp instrument cutting injury only occurs off the plane of tissue fracture, section neat, light contamination, light contusion of important tissues, replantation survival rate is high. If the blood circulation is good after connecting the severed arm, and actively carry out functional exercise after removing the external fixation, normal function can usually be restored. 2. Can not return to normal: crushing injury tissue damage is serious, if the scope of injury is not large, the limb will be shortened to a certain extent after removing the crushed tissue, there is still a high survival rate. The tissue damage of avulsion injury is extensive, often need complex vascular grafting, the success rate of reimplantation is low, even if successful, the functional recovery is also poor. Even if successful, functional recovery is poorer. Recovery of function may also be affected by prolonged tissue ischemia or infection after surgery. It is recommended that patients should take good care of themselves after surgery to avoid infection, observe blood circulation regularly, and actively perform functional exercises after removing external fixation to promote functional recovery.