Os peroneum

Last revised by Jing Woei Li on 20 Sep 2023

An os peroneum is a small accessory bone of the foot located at the lateral aspect of the cuboid within the substance of the fibularis longus tendon as it arches around the cuboid.

It is a very common anatomical variant, seen in up to 26% of feet 1.

It should not be mistaken for:

It can produce pathology (os peroneum syndrome) including fracture, fibularis longus tenosynovitis, and fibularis longus tendon tear.

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Cases and figures

  • Figure 1: illustration
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  • Case 1
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  • Case 2
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  • Case 3
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  • Case 4
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  • Case 5: os peroneum fracture
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  • Case 6: with peroneus longus rupture
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  • Case 7
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  • Case 8
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  • Case 9
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  • Case 10: in case of Freiberg disease
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  • Case 11: in a case of avulsion fracture 5th metatarsal styloid
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  • Case 12
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  • Case 13
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