The recovery process of sacral fracture can be divided into hematoma mechanization period, primitive bone scab formation period, and scab remodeling and shaping period, as follows. 1. Hematoma mechanization period: swelling occurs at the broken end of the sacral fracture, resulting in a large number of bone marrow stem cells secreted around the fracture, forming a local hematoma, and this stage takes 1~3 weeks. 2. Primary bone scab formation stage: internal and external bone scabs are formed at the fracture site of sacrum, neovascularization grows in, and new bone is gradually ossified to form new bone. Clinical healing can be achieved at this stage, and the fracture line can still be seen in the x-ray film. Adults need 3~6 months in this stage. 3. Scab transformation and molding period: the new bone trabeculae in the primitive bone scab gradually increase, and the arrangement is gradually regular and dense, the fracture broken end is resurrected by the removal of dead bone and new bone formation instead of crawling, and the fracture site of the sacrum forms a bony connection, and it usually takes 1~2 years for adults in this stage. The specific recovery process of sacral fracture is affected by the severity of the disease, the treatment program, the timing of treatment, age, physical condition and other factors, there may be individual differences, please follow the doctor’s instructions and standardized treatment.