Dislocations of the elbow joint are not common in children, accounting for about 6% of the elbow fractures and dislocations;based on the relative position of the proximal radioulnar joint to the distal humerus, it can be divided into posterior, anterior, medial and lateral dislocation,among which posterior dislocation is most common;part of elbow dislocations can be combined with ulnar, radial and humerus fractures, etc[1].