Isolated greater tuberosity (GT) fractures of the proximal humerus are common injuries and are usually associated with glenohumeral joint dislocations. In this report, we present a rare case of bilateral humeral isolated GT fractures without shoulder dislocation after electric shock. The patient was treated non-surgically and full functional recovery was noted. Mechanisms of injury, new morphological classification and surgical indications of isolated GT fractures of the proximal humerus are discussed here.