Bilateral agenesis of the tarsal navicular

Incidental discovery of isolated talonavicular coalition: Report of two cases

“…Talonavicular coalition was first described in 1879 [5]. Both autosomal dominant [5] and autosomal recessive [1] genetic transmission have been proposed based on family histories in different case reports. Perhaps both autosomal recessive and dominant etiologies exist.…”

“…The tarsal bones ossify at different ages in childhood. For instance, the talus ossifies at 7 months gestational age, and the navicular ossifies at age 4 years [5]. Tarsal coalitions are somewhat more common in males and occur bilaterally in roughly 50% of patients [6].…”