Accessory ossicles

Changed by Jeremy Jones, 4 Oct 2021

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Accessory ossicles are secondary ossification centres 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.

shoulder
- os acromiale
elbow
- os supratrochleare dorsale
wrist (mnemonic)
- os styloideum
- os hamuli proprium
- lunula
- os triangulare
- trapezium secondarium
- epilunate
spine
- accessory ossicle of the anterior arch of the atlas
- Oppenheimer ossicle
- os odontoideum
- persistent ossiculum terminale - Bergmann ossicle
- nuchal ligament sesamoid ossicle
hip
- os acetabuli
knee
foot (mnemonic)

~~-<a title="Persistent ossiculum terminale" href="/articles/persistent-ossiculum-terminale">persistent ossiculum terminale</a> - Bergmann ossicle</li>~~
+<a href="/articles/persistent-ossiculum-terminale">persistent ossiculum terminale</a> - Bergmann ossicle</li>

References changed:

1. Timins M. Osseous Anatomic Variants of the Wrist: Findings on MR Imaging. AJR Am J Roentgenol. 1999;173(2):339-44. <a href="https://doi.org/10.2214/ajr.173.2.10430131">doi:10.2214/ajr.173.2.10430131</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/10430131">Pubmed</a>
2. Jürgen Freyschmidt, Joachim Brossmann, Juergen Wiens et al. Borderlands of Normal and Early Pathological Findings in Skeletal Radiography. (2002) ISBN: 9781588901507 - <a href="http://books.google.com/books?vid=ISBN9781588901507">Google Books</a>
3. Richard B. Birrer, Bernard Griesemer, Mary B. Cataletto. Pediatric Sports Medicine for Primary Care. (2002) ISBN: 9780781731591 - <a href="http://books.google.com/books?vid=ISBN9780781731591">Google Books</a>
1. Timins ME. Osseous anatomic variants of the wrist: findings on MR imaging. AJR Am J Roentgenol. 1999;173 (2): 339-44. <a href="http://dx.doi.org/10.2214/ajr.173.2.10430131">doi:10.2214/ajr.173.2.10430131</a> - <a href="http://www.ncbi.nlm.nih.gov/pubmed/10430131">Pubmed citation</a>
2. Freyschmidt J, Brossmann J, Sternberg A et-al. Freyschmidt's "Koehler. Thieme. (2003) ISBN:1588901505. <a href="http://books.google.com/books?vid=ISBN1588901505">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/1588901505">Find it at Amazon</a>
3. Birrer RB, Griesemer B, Cataletto MB. Pediatric Sports Medicine for Primary Care. Lippincott Williams & Wilkins. (2002) ISBN:0781731593. <a href="http://books.google.com/books?vid=ISBN0781731593">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/0781731593">Find it at Amazon</a>

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