title: Fracture of the odontoid peg in ankylosing spondylitis: case report.
abstract: Fractures in patients with ankylosing spondylitis tend to affect the lower cervical spine. We describe a 50-year-old man who sustained fractures of the odontoid peg and body of the second cervical vertebra after a hyperextension injury. In absence of atlanto-occipital fusion, deformity from previous lower cervical spine injury may have contributed to susceptibility for this very rare combination of fractures. The patient was treated surgically with a good result.
authors.affiliation: Department of Diagnostic Radiology, University of Hong Kong, Queen Mary Hospital.
authors.forename: W C
authors.initials: WC
authors.lastname: Peh
authors.forename: E K
authors.initials: EK
authors.lastname: Ho
mesh_terms: D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000293:injuries*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D016103:Spinal Fractures / Q000000981:diagnostic imaging / Q000209:etiology*; D013167:Spondylitis, Ankylosing / Q000150:complications*