A cortical fold is a relatively minor bone injury and a specific type of fracture. It occurs after a minor injury to the bone and is not a serious injury. The continuity of the bone cortex of the bone is not obviously completely broken, and there is no obvious misalignment or obvious fracture line, but only a small localized injury to the bone cortex of the bone, slightly squeezed together with each other. It is in a state of no complete fracture, similar to an incomplete crack fracture that occurs locally, the degree of injury is relatively small, the impact on function is small, and the recovery time is relatively short. Recovery through conservative treatment, external fixation for about 3-4 weeks, together with blood circulation and bone strengthening treatment, such as oral wound jointing tablets and external creams such as blood circulation and pain relief cream, can restore normal.