Avulsion fracture of the 5th metatarsal styloid

Case contributed by Dr Bruno Di Muzio


Inversion of the foot when stepping on a curb.

Patient Data

Age: 42
Gender: Female

Left foot X-ray

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. 

Case Discussion

Avulsion fracture of the 5th metatarsal styloid is one of the more common foot avulsion injuries and accounts for over 90% of fractures of the base of the 5th metatarsal.  

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. 

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Case information

rID: 39059
Published: 18th Aug 2015
Last edited: 1st Sep 2015
Inclusion in quiz mode: Included

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