The criteria for fracture dislocation are the presence of a fracture, excessive external force or long-term strain, displacement at the original site of the fracture, when there is pain, swelling or limited activity, if the fracture has been reset, again dislocation, can be in the original fracture has been well recovered again pain, deformity, swelling, through the above criteria can be a preliminary diagnosis, a clear diagnosis also need to film, while asking experienced physicians An experienced physician will be able to determine the dislocation after physical examination. If the dislocation is severe, with anterior and posterior angular or rotational dislocation, it is usually accompanied by soft tissue contusions and joint capsule damage, which can be gradually recovered by repositioning or surgical treatment.