Presentation
Chronic bilateral ankle and foot pain.
Patient Data
Bilateral absence of navicular bones.
Articulation of cuneiform bones with the talus in the proximal and first metatarsal base in the distal part.
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Congenital absence of the navicular bone.
Degenerative changes between the navicular and cuneiform bones as decreased space, and subchondral edema and cystic changes.
Accessory ossicle next to the talus and medial cuneiform bones in the medial side.
Elongated talar neck and enlarged size of the talar head.
Extension of the foot dorsal intrinsic muscles (extensor hallucis brevis and extensor digitorum brevis) within the external opening of sinus tarsi.
Termination of the posterior tibialis tendon on the accessory ossicle and talus head at the inferomedial aspect.
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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.
Case Discussion
The absence of the tarsal navicular bone is extremely rare and it's often difficult to recognize something that is not there.
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