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Congenital dislocation of radial head without any abnormality is rare,and commonly reveals with anomalies in another organs.it can be appearance in one side or two side be cause of late manifestations,diagnosis of congenital dislocation of radial head is usually difficult. It is more important to recognize congenital anomaly of radial head from dislocation of elbow that events in trauma.this article presents one case of congenital dislocatin of radial head that is involved one side with out any anomaly.