The absence of obvious fracture line shadow is a radiographic description of fracture healing performance, for example, if the X-ray is taken about three months after the fracture, if the fracture has reached healing, it can be shown as fracture line blurring, fracture line disappearance or no obvious fracture line shadow, which means the fracture has reached clinical healing. In addition to the diagnostic criteria of X-ray, clinical examination by orthopedic surgeons, including touching and pressing the fracture site, is required to determine whether there are local symptoms or pain. The fracture site should be observed for deformity, and functional examination should be performed to determine whether there is recovery of function.