In case of comminuted fracture, the soft tissue damage is relatively heavy, and the preparation needed before surgery includes routine preoperative examination, such as biochemical examination, cardiac examination and chest X-ray examination. In addition, if the swelling is obvious, it is necessary to wait for the local skin and soft tissue to reduce the swelling before surgery, because excessive swelling will cause local skin and muscle necrosis, which will aggravate the local blood circulation obstacle after the surgery, and will make the local skin necrosis. Local skin necrosis will affect the internal fixation, and in severe cases, it will lead to osteomyelitis. Therefore, it is necessary to reduce the swelling of the skin and soft tissues of the surgical site before taking the surgical treatment, and to prepare the internal fixation used in the operation, such as special fixation instruments.