The os intermetatarseum is, according to Faber (1934), a supernumerary ossicle or an osteophyte developing in the commissure between the first and second metatarsals and articulating with both metatarsals and with the medial cuneiform bone. It is a rudimentary vestigial structure, not an accessory apophysis of the cuneiform. Its reported frequency of occurrence varies between anatomists: thus Pfitzner (1892; quoted by Faber) states an incidence of 12%, while Faber records only 1.2%. I estimate the frequency as being 2%–3%.
