The most direct and easiest way to quickly determine whether it is a sprain or a fracture is to go to the hospital and take X-rays to confirm the diagnosis. This is mainly because some undisplaced fractures, small avulsion fractures, and sprains are difficult to distinguish from the appearance as well as from physical examination, and require X-rays and CT to confirm the diagnosis. However, if there is an obvious deformity after the sprain and an obvious bone rubbing sound or bone rubbing sensation can be palpated, this situation can basically be judged as a fracture. After the sprain, regardless of whether there is a fracture, the affected limb should be braked, and the site can be given simple fixation, the material of fixation includes wooden boards, cardboard shells, etc., while local cold compresses can be applied, and the limb should be sent to the hospital for consultation and X-ray film for clear diagnosis and treatment.