An anomalous muscle in children with congenital talipes.

An anomalous calf flexor muscle has been observed in five children (involving 7 feet) in 125 surgical corrections of congenital talipes equinovarus deformity (5.6%). The sex, frequency of bilateral to unilateral deformity, position of the child in the family, maternal age, birth weight, gestation period, and type of delivery did not distinguish these children from those without the anomalous muscle, but they did have a greater frequency of first-degree relatives with talipes.