Os peroneum

Last revised by Dr Yahya Baba on 10 Oct 2021

An os peroneum is a small accessory bone of the foot located at the lateral plantar aspect of the cuboid within the substance of the peroneus 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, peroneus longus tenosynovitis, and peroneus 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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