supernumerary bone

supernumerary bone

; accessory bone normally inconstant, small, additional bones noted on radiographs, e.g. os trigonum, os tibiale externum, os vesalianum (see Table 1)
Table 1: Accessory bones in the foot
Accessory bone in the footLocation
Os tibiale externum (accessory navicular)Within tibialis posterior tendon, adjacent to proximal part of navicular tuberosity
Os trigonumPosterior margin of talus
Os peroneumWithin peroneus longus tendon, adjacent to inferior lateral border of cuboid/calcaneocuboid joint
Os vesalianumAdjacent to fifth metatarsal base
Os intermetatarseumBetween bases of first and second metatarsals
Os interphalangeusWithin insertion of flexor hallucis longus tendon, adjacent to plantar area of hallux interphalangeal joint
References in periodicals archive ?
The account of the presence of an supernumerary bone in the base of the 5th metacarpal and of the marrow in the bones of the carpus again aroused controversy, as Galeno did not accept this hypothesis.