Radiographic investigation of 3 Turkish sibs presenting with bowed legs disclosed physiological tibial bowing in the 7-month-old girl. Stage I Blount disease in the 26 month-old boy and Stage II Blount disease in the 45 month-old girl. The reported cases provide evidence for autosomal recessive inheritance. This observation points to genetic heterogenity, i.e. the existence of 2 genetically different, but radiologically indistinguishable disorders.