Os peroneum syndrome

Last revised by Dr Mostafa El-Feky on 10 Jul 2022

The os peroneum syndrome (sometimes termed painful os peroneum syndrome (POPS)) refers to a wide spectrum of conditions associated with an os peroneum at the lateral aspect of the foot. It can result in tenosynovitis and/or discontinuity of the peroneus longus tendon.

It can include one or more of the following 4:

  • acute os peroneum fracture or diastasis of a multipartite os peroneum
  • chronic (healing or healed) os peroneum fracture or diastasis of a multipartite os peroneum with callus formation which can result in stenosing tenosynovitis of the peroneus longus 
  • attrition or partial rupture of the peroneus longus tendon, proximal or distal to the os peroneum
  • frank rupture of the peroneus longus tendon with discontinuity proximal or distal to the os peroneum
  • presence of a large peroneal tubercle on the lateral aspect of the calcaneus which entraps the peroneus longus tendon and/or the os peroneum during tendon excursion

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Cases and figures

  • Case 1
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