accessory bones

(redirected from accessory ossicles)

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 ossicles in the foot are in variable appearance and prevalence.
Sesamoids and accessory ossicles of the foot: anatomical variability and related pathology.
There are different sesamoids and accessory ossicles in the skeleton.
Os peroneum is an accessory ossicle located within the substance of the peroneus longus tendon.
The plain film showed the presence of an accessory ossicle in the lateral aspect of the midfoot, located in the path of the peroneal tendons with cortical discontinuity, fragmentation, irregular margins, and heterogeneous density.
CONCLUSION: Sesamoids and accessory ossicles seen in the foot vary widely in their prevalence and appearance.
Coskun N, Yuksel M, Cevener M, Arican RY, Ozdemir H, Bircan O et al (2009) Incidence of accessory ossicles and sesamoid bones in the feet: a radiographic study of the Turkish subjects.
14) Accessory ossicles tend to be rounded with a well corticated margin, while fracture fragments may be irregular and demonstrate jagged edges.
10,13) The os trigonum is an accessory ossicle commonly located posteriorly to the lateral tubercle and should not be mistaken for a fracture of the posterior process of the talus.
Although accessory ossicles and sesamoid bones are generally considered clinically insignificant anatomic variations, they can become symptomatic.
We have reviewed a spectrum of pathology involving accessory ossicles and sesamoid bones.
These could have been incorporated at the expense of pathologies which are rarely encountered, such as sesamoiditis and accessory ossicles.