Blount's disease is one of the pathological idiopathic causes of genu varum ; it include the infantile and late-onset (adolescent) types. Pathological changes are localized to the posteromedial part of the proximal tibia due to the increased stresses on this part. Patients are obese with varus and internal torsion of the tibia. In infantile tibia vara operative treatment before the age of 4 years, with mild to moderate deformity with a single corrective osteotomy is the treatment of choice. In late-onset type or neglected infantile type treatment by external fixators is becoming more popular for gradual precise correction. The currently used fixators are Ilizarov, TSF and T-Garches external fixator for distraction osteogenesis, and Modified Wagner fixator-distractor for epiphyseal distraction.