For internal fixation of fractures, it is generally recommended to remove the pin as soon as possible after the fracture heals, and the pin should be removed for functional training in about two months. The advantage is that it is easy to operate, the side injury is small, and the cost of steel pins is not expensive, very low; the disadvantage is that the strength is not enough compared to the bone plate and screws, and the fixation will affect the corresponding functional training. According to the above characteristics, it is decided to remove the steel pin for functional training as early as possible when the fracture is healed again, so that the advantages of steel pin fixation can be brought into play and the disadvantages of steel pin fixation can be avoided.