Whether a fracture requires a CT or MRI depends on the condition of the fracture and whether it is combined with damage to other tissues. Most of the common examinations of fractures are X-ray examination, because X-ray examination can show the displacement of the fracture end and the number of fracture fragments more clearly, and make accurate diagnosis. 2. Some of the fractures can be identified by CT examination because of the bone covering and the hidden and inconspicuous fracture line, and CT examination can detect the fracture line very clearly. 3. In the vast majority of cases, patients with fractures do not need to undergo MRI, but only when the fracture is extremely minor, the fracture line is not obvious, or when there is no determination of whether there is soft tissue damage, cartilage and ligament damage such as the need to determine the cruciate ligament injury in the knee joint, then need to undergo a magnetic resonance examination. When a fracture occurs, it is important to improve the examination under the guidance of the doctor according to the specific circumstances of the fracture, so as not to delay the condition.