If a fracture is not visible on film, it is usually a crack fracture, incomplete fracture or green branch fracture, etc. It may also be in areas where it is easy to overlap, such as head and face fractures, spine, chest rib fractures, and long abdominal femur of the hand and foot, which are usually easily blocked by the overlapping of their own bones and cannot be seen clearly on film, so it is visible on film. However, it can be seen by doing CT, especially 3D spiral CT, which is usually given in plain scan or in sagittal or coronal plane, and the fracture line can be seen completely in the 3D state, and the diagnosis can be made clearly.