A 79-year-old female patient accidentally fell down with left upper limb outstretching. After the injury, the left shoulder joint was painful, swollen, and limited in movement. The doctor of local hospital gave external application of drugs for the injury, but the symptoms did not improve. So, the patient went to the hospital again. The dislocation was reduced with Hippocrates manipulation and immobilized with triangular scarf suspension. X-rays showed avulsion fracture of the greater tubercle of humerus after reducing anterior dislocation of the left shoulder joint (Fig. 10.1). However, the patient felt severe pain and swelling of the shoulder joint. 3D CT revealed a displaced fracture of the greater tubercle of the humerus (Fig. 10.2). The physical examination revealed swelling and dropping of the left wrist, dysfunction of the thumb, finger, and wrist extension (Fig. 10.3), Soft tissue swelling of the left shoulder joint, tenderness in the greater tubercle of the humerus (++), decreased sensation of the back and palm of hand, and positive paper pinch test. Active and passive movements of the shoulder joint were significantly limited. Electromyography suggested left brachial plexus injury. Diagnosis: dislocation of left shoulder joint and avulsion fracture displacement of greater tubercle of humerus combined with left brachial plexus injury.