Usually when a fracture is suspected after an injury and not detected by x-rays at the time, the doctor will recommend that the patient review the x-rays again in two weeks, when the fracture will be clearly visible. Many people ask why a fracture cannot be detected in time when a trauma is taken, but this is due to some specific types of fractures and the natural physiological process of healing after a fracture. According to the shape and degree of the fracture after the fracture can be divided into incomplete fracture and complete fracture, where incomplete fracture or complete fracture without displacement, because the shape of the bone is not altered, and some subtle fracture line is beyond the range of the X-ray image, which may be on the X-ray film but can not see the fracture. However, due to the reaction of the fracture, at the beginning stage due to the disruption of the local blood supply at the fracture end, necrosis and resorption of several millimeters of bone at the fracture end occurs due to ischemia and injury. This process of decomposition and resorption usually takes about two weeks, so that when the film is taken again after two weeks, a clear widened fracture line will be found. Therefore, when a fracture is not found on the radiograph at the time of the trauma, and a fracture is highly suspected, it is important to take another radiograph in two weeks. Also follow the doctor’s advice during this time to protect and fix the fracture well so that it does not displace.