To analyze the efficiency of simple step-cut translation osteotomy for cubitus varus and valgus deformity of the distal humerus, which was performed using a posterior approach and fixation of a Y-shaped metal plate.

In 20 cases that we were able to observe closely for more than 1year, we classified clinical and radio logical results according to the criteria of Oppenheim and Bellemore.

Humerus-Elbow-Wrist angle had been corrected (from 16.6° to 7.6° in the cubitus varus and from 33.6° to 8.3° In the cubitus valgus). Change of the lateral and medial prominence index (average 8.38 from -15.74 to -7.36 in the cubitus varus and 7.25 from -17.68 to -10.43 in the cubitus valgus, respectively) provided satisfactory results with decreased protrusion on the medial and lateral condyles. In all cases except one, the range of motion was improved and results were good and excellent.

Simple step-cut translation osteotomy for the distal humerus obtained very firm fixation with a wedge-shaped osteotomized surface and a Y-shaped metal plate, therefore, early movement was possible. Also because of the dfficiency of the translation osteotomy, we obtained cosmetically satisfactory resullts with a remarkable decreases in protrusion on the medial and lateral condyles.