The period of fracture healing is divided into two phases: first, the initial clinical healing, that is, the fracture break will gradually form a bone scab as the hematoma is gradually mechanized. During the growth of the scab, bone formation occurs at the broken end of the fracture, which takes place over a period of about 4-6 weeks. At this time, initial healing has occurred, but it is not yet strong. Strenuous exercise and excessive activity can cause the fracture to reoccur, and bony healing can be achieved in about 3 months. Secondly, bony healing is a very strong healing, that is, the fractured bone grows gradually after the formation of the broken end of the bone, the bone hardness gradually increases, and gradually realize the bone marrow cavity recanalization. After recanalization, the entire bone grows strong enough to withstand large forces, such as strenuous exercise and frequent functional activities, without causing re-fracture. Bone healing can be achieved in about 3 months, but for fractures of the tibia in the lower middle third of the lower leg, for example, the healing time is relatively longer due to poor blood circulation, and it takes about 4 months to achieve bone healing.