The results of operative correction of 13 cases of tibia vara in 10 children with advanced infantile Blount's disease are presented. All of the children were operated by "double-elevating" osteotomy. An essential element of this procedure was the reconstruction of the horizontal level of the medial tibial plateau. The average follow-up after treatment was 8 years 1 month. We recommend this method of osteotomy in cases of considerable depression of the medial tibial condyle with the defect of epiphyseal bone and as a bone bridge between the metaphysis and the epiphysis.