In 1937 Blount described a series of 28 patients with 'Tibia vara'. Since then, 
a number of deformities in the tibia and the femur have been described in 
association with this condition. We analysed 14 children with Blount's disease 
who were entered into a cross-sectional study. Their mean age was 10 (2 to 18). 
They underwent a clinical assessment of the rotational profile of their legs and 
a CT assessment of the angle of anteversion of their hips (femoral version). We 
compared our results to previously published controls. A statistically 
significant increase in femoral anteversion was noted in the affected legs, with 
on average the femurs in patients with Blount's disease being 26 degrees more 
anteverted than those in previously published controls. We believe this to be a 
previously unrecognised component of Blount's disease, and that the marked 
intoeing seen in the disease may be partly caused by internal femoral version, 
in addition to the well-recognised internal tibial version.