Congenital vertical talus and congenital calcaneovalgus deformity: a comparison.

It is essential to distinguish congenital vertical talus from calcaneovalgus deformity in infants as the proper treatment must begin at an early age. The key clinical finding in the differential diagnosis of flexible and rigid flatfoot conditions is the range of motion at the subtalar joint. In rigid flatfoot conditions, subtalar joint motion is impossible because of the rigidity of the deformity. Also, in the rigid type of deformity, the calcaneus will be in an equinus position.