Harris or Axis Ring: an Aid in Diagnosing Low (Type 3) Odontoid Fractures

Author: Mortelmans Luc J. M.   Geusens Eric A. M.   Sabbe Marc B.   Delooz Herman H.  

Publisher: Informa Healthcare

ISSN: 1102-4151

Source: European Journal of Surgery, Vol.165, Iss.12, 1999-12, pp. : 1138-1141

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Abstract

Objective: To present our experience of diagnosing fractures of the odontoid process on lateral radiographs of the cervical spine that show the Harris (axis) ring.Design: Retrospective study.Setting: Teaching hospital, Belgium.Subjects: 12 patients with multiple injuries, including cervical spine, 8 of them unconscious or uncooperative.Interventions: Cross table lateral view of the cervical spine.Main outcome measure: Identification of otherwise hidden type 3 axial fractures.Results: Diagnosis of low odontoid fractures in all cases.Conclusion: The Harris ring is disrupted in low odontoid fractures and intact in fractures of the odontoid process. Awareness of this sign will allow diagnosis of otherwise hidden axial fractures.

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