Alp Bayramoğlu1, Deniz Demiryürek1, Ayşegül Fırat1, Ali Öznur2, M. Hakan Özsoy3

1Department of Anatomy, Medicine Faculty of Hacettepe University, Ankara, Turkey
2Department of Orthopedics and Traumatology, Ankara Güven Hospital, Ankara, Turkey
3Department of 1st Orthopedics and Traumatology, Ankara Training and Research Hospital, Ankara, Turkey

Keywords: Talus fracture; os supranaviculare; Pirie’s bone; basketball player.

Abstract

The os supranaviculare is an accessory bone located on the dorsal aspect of the talonavicular joint close to the midpoint. This rare incidental skeletal variant has an estimated prevalence of 1%. It may rarely become symptomatic and should not be confused with cortical avulsion fractures of navicular or talar head. We present the case of a 25-year-old professional basketball player with pain on the dorsum of his right foot after twisting his ankle during a regular season match. Magnetic resonance imaging findings of the player’s foot represented a flake of bone on the superior part of the talar head. The differential diagnosis and clinical outcome of this unusual case are briefly discussed.