Blount disease is one of the pathological idiopathic causes of genu varum. Includes 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. Treatment by osteotomy followed by gradual correction and external fixation is becoming more popular for precise correction and diminished morbidity . Prognosis depends on the patient's age and the severity of deformity at the time of intervention.