Accessory ossicles

Accessory ossicles are secondary ossification centers that remain separate from the adjacent bone. They are usually round or ovoid in shape, occur in typical locations and have well defined smooth cortical margins on all sides.

In most cases, they are congenital in origin, although they may occur as a result of trauma or local degenerative disease 2.

The significance of accessory ossicles is their potential to mimic avulsion fractures.

Share article

Article information

rID: 24090
Section: Anatomy
Synonyms or Alternate Spellings:
  • Accessory ossicle

Support Radiopaedia and see fewer ads

Cases and figures

  • Figure 1: accessory ossicles of the foot
    Drag here to reorder.
  • Case 1: fabella
    Drag here to reorder.
  • Figure 2: accessory ossicles of the foot
    Drag here to reorder.
  • Case 2: os triangulare
    Drag here to reorder.
  • Case 3: os trigonum
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.