The authors reviewed 20 patients with cubitus varus deformity who were treated with the interlocking wedge osteotomy. All deformities including medial, posterior tilt and internal rotation of the distal fragment can be simultaneously corrected with this osteotomy. There were 14 males and 6 females whose average age was 5.0 years at injury and 14.1 years at surgery. The average follow-up period was 37 months. Thirteen patients had excellent results, 6 good, and 1 poor. The mean carrying angle was improved from 21.5 degrees of varus to 8.8 degrees of valgus, compared to 9.4 degrees of valgus on the uninjured side. The mean flexion of the elbow increased from 123.9 degrees to 134.3 degrees, and the mean hyperextension decreased from 12.0 degrees to 7.5 degrees. Three-dimensional correction and stable fixation can be achieved with this osteotomy.