CHORUS
Collaborative Hypertext of Radiology
Musculoskeletal system
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axis fracture
- incidence: 6% of cervical spine injuries
- associated with atlas fractures in 8%
- hyperflexion injury: odontoid fracture
- type I
- avulsion of tip of odontoid (5-8%)
- difficult to detect
- type II
- fracture through base of dens (54-67%)
- complication: nonunion
- type III
- subdental injury (30-33%)
- prognosis: good
- DDx:
- os odontoideum
- ossiculum terminale
- hypoplasia/aplasia of dens
- hyperextension injury: hangman's fracture
Yong H. Hahn, MD - 2 February 1995
Last updated: 1 October 2013
Copyright © 2013, Charles E. Kahn, Jr.
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