The recovery process of avulsion fracture needs to go through the following three phases: the first phase is called hematoma mechanization phase, there will be bruises in the middle of the fracture gap after the avulsion fracture, and the bruises will form a fibrous bone scab under the action of fibroblasts, this process is called hematoma mechanization phase, in the first two weeks after the fracture. The second phase is called the primitive bone scab phase, the fibrous bone scab formed after the fracture, under the deposition of calcium salts, gradually form the bony bone scab, at the same time, the osteoblasts on the endosteum and periosteum form the bone scabs, also called the inner bone scabs and the outer bone scabs, the inner bone scabs, outer bone scabs and the intermediate bone scabs are connected together, the fracture will form the clinical healing. The third phase is called bone scab transformation phase, after the osteoclast’s bone-breaking effect and osteoblast’s bone-forming effect, make the bone marrow cavity of the fracture broken end reopen, the bone cortex connects, and the bone scab formed gradually disappears, and finally achieves the same as the normal bone, and restores the situation of normal bone.