Fracture line shadows are mostly a description of the site of a possible fracture during an x-ray examination, which also suggests the presence of a fracture. In some cases, it is difficult to determine whether a fracture has occurred because the displacement of the broken ends is not very obvious and the bone cortex is intact. When radiologists review plain radiographs, because they are computerized, they can set the contrast of the plain radiographs to detect the fracture line, and in this way, they can clarify whether a fracture exists or not. It can also be seen after the fracture, X-ray review, because in the fracture healing stage, there is a bone scab through the fracture line, if the fracture has not completely healed, at this time can be found in the fracture fracture line shadow. If the X-ray suggests that there is a fracture line shadow, combined with the clinical examination, most of the diagnosis of whether there is a fracture or not, if not yet able to determine, can be based on the basis of the CT plus three-dimensional reconstruction to determine.