To determine whether there is a fracture in a sprained foot, clinical symptoms and imaging tests are needed. 1. Clinical symptoms: after spraining the foot, there are obvious pain and swelling in the ankle joint, and if there is a serious fracture, there may be localized bone friction or friction sound, and it is impossible to bear weight. 2. Imaging examination: after twisting the foot, if you suspect that there is a fracture, you need to take pictures through imaging methods to make a clear diagnosis, such as X-ray, CT, etc. Generally speaking, the imaging examination will find that the localized bone friction sensation or friction sound will be found. Generally speaking, imaging examination will find localized fracture of the bone cortex, which is a manifestation of fracture. It is difficult for non-professionals to determine a fracture through symptoms, and once a foot sprain occurs, it is important to seek prompt medical attention to determine whether a fracture has occurred. If a sprained foot leads to a fracture, it is necessary to rest with braking in the early stage, and to be fixed as soon as possible under the guidance of a professional physician. Before the fracture is not healed, do not go down to the ground too early weight-bearing activities, so as not to produce the phenomenon of fracture displacement, and then gradually carry out functional exercise to prevent sequelae.