accessory bones

accessory bones

; accessory ossicles inconstant, independent, well-defined corticated bones occurring in 18-30% of normal feet, arising as separate centres of ossification and persisting as separate entities from adjacent constant bone (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 ?
Accessory bones, or ossicles, are considered to be normal anatomic variants.