MRI is able to observe muscle damage, mainly through the signal change after muscle damage. MRI is mainly of high diagnostic value for human soft tissues such as muscles, ligaments, organs, etc. It is not as good as CT and X-ray for injuries or lesions of bone structures such as fractures and bone tumors. Therefore, MRI is generally preferred for muscle and other soft tissue injuries to help make the diagnosis of soft tissue injuries. After muscle injury, MRI is mainly used to determine the presence of muscle injury by signal change signs. For example, when the muscle is damaged in degree I, it can be seen that the site of muscle injury shows a high signal shadow on the T2 image and spreads along the interstices of the muscle bundles; when the muscle is damaged in degree II acutely, it shows a diffuse high signal shadow on the T2 image; and when it is damaged in degree III, it can be seen that the continuity of the muscle fibers is interrupted, and retracted, and so on. Muscle injury requires timely consultation and appropriate treatment.