Patients who want to know whether their hand is dislocated can be judged by the following aspects: First, whether the patient has an acute violent injury, including violent twisting of the joint, impact on the joint, or blow to the joint. Second, after being subjected to violence, the joint will show symptoms of joint dislocation such as deformation, swelling, pain and dysfunction, and can also be compared with the contralateral or normal joint to find deformities and abnormalities of the joint. Third, after joint dislocation, there will be signs of elastic fixation, and the joint deformity is in a fixed position or angle that cannot be moved. If a fracture is caused, bone rubbing sounds and bone rubbing sensation will occur when the injured joint is moved, and the dislocated joint will appear to be elastically fixed and immobile.