Tarsal coalition presenting as a pes cavo-varus deformity: report of three cases and review of the literature.

The diagnosis of idiopathic pes cavo-varus is one of exclusion. Typically a neuropathic etiology is sought. Equally well known is the association of rigid flatfoot deformity with calcaneonavicular and subtalar coalition. Less well known is the association of pes cavo-varus with tarsal coalition. This is a report of three patients who presented with cavo-varus deformities without underlying neurologic abnormalities, one with a calcaneonavicular coalition and two with subtalar coalitions, the latter an entity not previously described in association with pes cavo-varus, to our knowledge.