Os calcaneus secundarius

Last revised by Mostafa Elfeky on 1 May 2023

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

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