Patients with sprained feet can determine whether there is a bone injury by the following methods: First, diagnosis: if there is a bone injury, you can see obvious deformity in the appearance, as well as localized bruising and swelling, then X-ray examination should be carried out to make a diagnosis. Second, palpation: after the foot sprain, if the sound of bones rubbing against each other can be touched at the injured place, it can be judged that there is bone damage. Third, auxiliary examination: Diagnosis can be made through X-ray film as well as CT examination for injuries with obvious fracture displacement. If there is a wire-like fracture or non-displaced fracture, part of the patients can not be seen on the X-ray film, and can be diagnosed and treated by CT examination.