accessory bone

accessory bone

the os trigonum in the ankle joint - a bone present in only <10% of the population. In practice, rarely injured in sport but can be confused on X-ray with an avulsed fragment of bone or loose body.

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 ?
This case clearly demonstrated massive bone erosions and kinked alignment at the junction of the accessory bone and the patella by multiplanar reconstruction with computed tomography.
Os accessorium supracalcaneum (OAS) is the rarest form of accessory bone in the foot.
The accessory bone can separately accommodate donor cells, bypassing irradiation.
They made an accessory bone that can separately accommodate donor cells, keeping the host cells and bypassing irradiation.
6,8,9,13,16-18) Surgery can be simple excision of the accessory bone or the Kidner procedure can be used.
This treatment was based on the old literature that considered that clavicle is an accessory bone in the body and complications like nonunion and malunions have no adverse effects and are of radiographic interest only.
If conservative measures fail, open or arthroscopic surgical excision of the abnormal accessory bone is recommended.
Saxena removed an accessory bone from the foot of U.
Daily contact practice, however, may stimulate accessory bone growth in children's feet and ankles.
INTRODUCTION: Wormian bones are accessory bone which occurs within the cranial sutures and fontanelle.
This type of condition, an accessory bone in the foot, has never been recognized in the literature.
Management of Foot Pain Associated With Accessory Bones of the Foot: Two Clinical Case Reports.