Displaced fracture is simply a fracture that is poorly aligned, that is, the two broken ends of the fracture are not in their original anatomical position, and the normal anatomical structure of the bone is disrupted. For this kind of fracture, if the fracture can be treated by manipulation, it can be fixed by manipulation first, and use plaster cast or splint for a period of time, and only after the fracture is healed can the external fixation material be removed. If the effect of manipulation is not good or the fracture site cannot be maintained by external fixation devices, such as severe comminuted fracture or fracture involving joints, the effect of manipulation is not good, it is necessary to actively carry out surgical incision and reduction, and use plate screws, intramedullary nails or Kirschner’s pins and other materials to fix the fracture in a normal anatomical position, to maintain the stability of the fracture and to prevent the fracture from re-displacing.