Most bone fractures can heal on their own without casting, and only a very small number of bone fractures cannot heal on their own, and are difficult to heal even with casting or other methods such as surgical immobilization. Even if the fracture is not cast, it is necessary to take other measures to fixate the injured part, such as splints or braces, etc., and at the same time, it is also necessary to elevate the affected limb appropriately, and to make outpatient review regularly to make sure that the fracture is healing and whether there is any displacement. Clinically, there are a small number of bone fractures, such as femoral neck fracture, which are difficult to heal even with external fixation in plaster or brace, or even surgery, and are prone to necrosis of femoral head and other manifestations, and early activities of this kind of fracture can easily lead to displacement of the fracture, and the patient needs to stay in bed for a long period of time, which is prone to complications such as pressure sores, lung infection and urinary tract infection. If the fracture occurs, you should go to the hospital in time, and standardize the treatment under the guidance of the doctor.