Accessory ossicles

Accessory ossicles are secondary ossification centres that are 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 ability to mimic avulsion fractures.

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Article information

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

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Cases and figures

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    Figure 1: accessory ossicles of the foot
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    Case 1: fabella
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    Figure 2: accessory ossicles of the foot
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    Case 2: os triangulare
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    Case 3: os trigonum
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