The differentiation between physiological bowlegs and infantile Blount's disease 
in patients aged 11-30 months is very difficult. Nevertheless, diagnosis is 
deemed important because treatment of infantile Blount's disease is recommended. 
Fourteen patients with severe bowing of the legs seen in our outpatient clinic 
were investigated retrospectively. We examined them and measured the 
tibiofemoral and metaphyseal/diaphyseal angles in radiographs taken at their 
first presentation. The finding that the tibiofemoral angle is not helpful in 
differential diagnosis could be confirmed but, contrary to reports by other 
authors, neither was the metaphyseal/diaphyseal angle. In view of the 
spontaneous recovery of all investigated patients, it must be doubted whether a 
diagnosis of infantile tibia vara can be made in early infancy, and whether 
infantile Blount's disease is a diagnosis in its own right.