Test your knowledge: anatomy of the lateral foot region
In the picture above, you can see an additional bone at the lateral side of the foot nearby the cuboid bone/ metatarsophalangeal V. This bone is rarely seen in patients and can be misdiagnosed as a part of a Jones fracture. Do you know the name of this additional bone?
The correct answer was: a peroneal bone or ‘os peroneum’.
The peroneal bone is a sesamoid bone that is located within the tendon for peroneus longus muscle. The shape of the bone can be round, oval, triangular, irregular and can also be found as bipartite or multipartite.
The etiology of the peroneal bone is unknown, however, it has been thought that it arises from both mechanical and genetic factors. A literature search of contemporary anatomical texts, atlases and specialty radiographic texts revealed incidence rates of 7.69%, 16.6% and 20% (different cadaveric studies).
Want more information on this subject? Click here for an article on the os peroneum and its clinical importance!