Os peroneum

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

Differential diagnosis

It should not be mistaken for:

Related pathology

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

Anatomy: Lower limb
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Article information

rID: 7648
Section: Anatomy
Synonyms or Alternate Spellings:
  • Os peroneii

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Cases and figures

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    Figure 1: illustration
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    Os peroneum
    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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