Magnetic Resonance Imaging (MRI) can help determine the location and severity of the tendon injury. In particular, MRI angiography is very valuable in diagnosing the torn portion of the rotator cuff as it clearly shows the torn portion of the rotator cuff. Rotator cuff injuries are characterized by different levels of MRI. Grade 1.0: Normal MRI with uniform low signal. Grade 2.1: The rotator cuff generally has a normal morphology with diffuse or linear high signal on MRI. Grade 3.2: The rotator cuff may show thinning or irregularity, localized signal increase, and watery signal may be seen in the tendon in partial tears, but only part of the tendon is involved. Grade 4.3: Abnormal signal increase may involve the whole tendon, and fluid enters into the tendon fissure in the case of a whole tendon tear, which may be accompanied by different degrees of tendon retraction. If rotator cuff injury is diagnosed, early and standardized treatment is recommended to reduce the adverse effects of the disease.