Coxa pedis dysplasia in congenital convex pes valgus

A dissection was carried out on bilateral congenital convex pes valgus in a newborn who died of congenital visceral malformations. The main finding wa s a modification in the neck-body relations of the talus. Nearly all muscle s showed morphologic alterations. No insertional or histologic anomalies we re shown. The plantar calcaneonavicular ligament was stretched and attenuat ed. The alterations observed in our case affected all the anatomic structur es forming and stabilizing the coxa pedis. Our case suggests that the dyspl astic evolution of the talar body-neck angle halts, and the neck assumes an adducted, medially inclined and plantar-tilted angle with respect to the t alar body. We propose the term "congenital dysplasia of the coxa pedis" to describe this condition, because it emphasizes the primary alteration in th e morphogenesis of the talocalcaneonavicular joint.