Minimal mortise joint effusion.
Congenital absence of the navicular bone.
Degenerative changes between the navicular and cuneiform bones as decreased space, and subchondral edema and cystic changes.
Elongated talar neck and enlarged size of the talar head.
Extension of intrinsic muscles of the foot in dorsal aspect (extensor hallucis brevis and extensor digitorum brevis) to the external opening of sinus tarsi.
Termination of the posterior tibialis tendon on the talus head at the inferomedial aspect.