Avulsion fracture of the 5th metatarsal styloid
Inversion of the foot when stepping on a curb.
Left foot X-ray
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There is a avulsion fracture of the 5th metatarsal styloid. An os peroneum and a bipartite medial hallux sesamoid are also noted as anatomical variants.
An os peroneum is a small accessory bone located at the lateral plantar aspect of the cuboid within the substance of the peroneus longus tendon as it arches around the cuboid
Multipartite hallux sesamoids are a commonly seen normal variant, present in up to 33% of hallux sesamoids. The medial (tibial) sesamoid is more likely to be multipartite than the lateral (fibular) sesamoid because it more commonly has more than one ossification centre.