Talonavicular joint coverage and bone morphology between different foot types

Abstract

This study explored three dimensional (3D) talonavicular joint (TNJ) coverage/orientation and bone morphology to reveal parameters that could classify and identify predispositions to cavus and planus feet. 3D models of 65 feet from 40 subjects were generated from computed tomography images classified as pes cavus, neutrally aligned, or asymptomatic/symptomatic pes planus. We calculated the talar and navicular overlap (TNJ coverage). We also measured orientation of the navicular, morphological parameters of the talus and navicular, and angular position of the talar head to body. Pes cavus showed significantly less talonavicular coverage (58-±-2% talus and 86-±-2% navicular) compared to asymptomatic pes planus (63-±-2% and 95-±-2%) and neutrally aligned feet (98-±-2% navicular), and significantly more navicular dorsiflexion and adduction relative to the talus (p-