We describe our experience in treatment of lower limb dyssymmetries in patients who had undergone treatment for a primitive malignant bone tumor. Eight cases are reported, six male and two female patients whose ages ranged from 12 to 16 years. The dyssymmetry varied from 7 to 18 cm. In seven patients, lengthening and consolidation has already been completed; the lengthening process is still in progress in the eighth patient. The dyssymmetry was fully corrected in five patients; residual dyssymmetry of 3 and 4 cm remained in the other two. We believe that this type of operation could be useful in patients with severe dyssymmetry as a consequence of malignant bone tumors.