[Increasing incidence of clubfoot in the county of Frederiksborg].

The incidence of congenital clubfoot in Frederiksborg County, Denmark, was studied over a period of 16 years (1979-1994). Altogether 60, 186 live infants were born, and of these 72 had a congenital clubfoot. Twenty-five children (35%) had bilateral clubfoot and 54 (75%) were boys. The overall incidence was 1.20 per thousand children. The incidence increased significantly during the observation period and was 2.41 per thousand in 1994. We cannot explain the rise in incidence.