Os peroneum

Last revised by Jing Woei Li on 20 Sep 2023

An os peroneum is a small accessory bone of the foot located at the lateral aspect of the cuboid within the substance of the fibularis 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, fibularis longus tenosynovitis, and fibularis longus tendon tear.

ADVERTISEMENT: Supporters see fewer/no ads