Accessory navicular bone
Inversion injury of the right foot with medial tenderness.
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- No acute fracture or dislocation
- Type II accessory navicular bone with mild adjacent soft tissue oedema
An accessory navicular bone, also referred to as os naviculare accessorium, is a relatively common anatomical variant present in around 10% of people. Although usually asymptomatic, an accessory navicular bone can cause medial foot pain called os naviculare syndrome.