Os calcaneus secundarius

Last revised by Daniel J Bell on 05 May 2022

An os calcaneus secundarius is an accessory ossicle of the anterior calcaneal process present in up to 5% of the population at cadaveric examination. The ossicle can be a cause of ankle pain and may mimic bifurcate ligament avulsion fracture of the anterior calcaneal process.

Differential diagnosis

  • fracture of the anterior process of the calcaneus -  difficult to distinguish from an os calcaneus secundarius if the suspected fracture is subacute or chronic.
  • fracture of the tuberosity of the calcaneus
  • calcaneus accessorius
  • cuboideum secundarium
  • os sustentaculi

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3
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