If the foot is smashed to determine whether the bone is injured, observe whether local abnormal activity is formed. Once abnormal joint activity is formed in a part where activity should not occur, it means that a fracture must be produced here, and also observe whether local deformity is formed, which can be compared with the opposite limb to see whether there is any obvious protrusion or depression in the injured part, and see whether there is any severe pressure pain. If so, gently tap around the painful area to see if there is any longitudinal percussion pain, and if a bone rubbing sound or sensation of bone rubbing is formed. Once a localized bone rubbing sound is formed or a bone rubbing sensation can be palpated, it also indicates the presence of a fracture. In some cases, the fracture is not obvious and needs to be examined by X-ray and radiographs, and the wound needs to be disinfected. If there is no obvious fracture, you can apply cold compresses locally, elevate the foot to promote blood return, which can reduce swelling and pain, disinfect locally with iodophor and cover with iodophor gauze, and apply cold compresses within 24 hours.