A, DeBastiani technique for corticotomy. Using limited open exposure and a 4- or 5-mm drill, multiple holes are drilled in anterior half of bone. These are connected with 5-mm osteotome, which also is used to complete corticotomy posteriorly. B, Orthofix device for femoral lengthening. To control varus deviation, three screws are used proximally and three distally, or frame can be applied with prophylactic valgus built into construct. SEETECHNIQUES 29.48AND29.49.