The main reason for leaving the steel nail outside in heel reduction is to facilitate the removal of the nail and to assist in fixation of the fracture block. 1. Convenient to take out the steel nail: it is very simple to take out the steel nail with the exposed steel nail, as long as the condition of fracture healing allows, you can use the Kirschner pin pliers to pull out the steel nail directly. 2. Assist in fixation of the fracture block: If internal fixation is present in heel reduction, it means that internal fixation alone cannot fix the fracture site firmly, and exposed steel pins are needed to assist in fixation of the fracture block. It is suggested that if there is any abnormal situation after the heel osteotomy, it is necessary to consult a doctor in time, so as not to delay the treatment and cause serious consequences, and also pay attention to the wound care work.