Blount Disease in 3 year old boy from India.

Idiopathic tibia vara (Blount disease) is an acquired form of tibial deformity found mainly in children who are Afro-Caribbean and it is also associated with obesity, short stature and early walking. There does not appear to be an obvious genetic factor. It is uncommon1. The incidence of Blount disease in the India is unknown. The estimated prevalence of infantile Blount disease in the population of young children with significant bow legs in the United States is 0.007 or less than 1%. The exact frequency in persons of all ethnicities is unknown and most likely is less than 1%2, 3, 4,5. Blount disease or idiopathic tibia vara is a developmental deformity of the proximal tibial medial physis that produces a varus deformity of the knee6. It has been classified into three types depending on the age at onset : infantile (1-3 yr), juvenile (4-10 yr) and adolescent (11 yr or older).