To self-judge whether a fracture has occurred, the following aspects can be determined: First, the fracture site or the injured area is very swollen, with subcutaneous ecchymosis, bruising or the appearance of tension blisters or tension blisters, suggesting a fracture. Secondly, the injured part is deformed, such as the affected limb is shorter than the healthy lower limb, or has become angular, and the limb at the fracture site is in a folded angle, there is a possibility that a fracture has occurred. Third, the injured limb is unable to use the force, suggesting that the leverage of the bone has been lost, or occurs in the lumbar region, and the lumbar region is unable to use the force, suggesting that a fracture has occurred.