title: Increased atlanto-axial instability secondary to an atraumatic fracture of the odontoid process in a patient who had rheumatoid arthritis. A case report.
authors.affiliation: Department of Orthopaedic Surgery, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.
authors.forename: W T
authors.initials: WT
authors.lastname: Ballard
authors.forename: C R
authors.initials: CR
authors.lastname: Clark
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000000981:diagnostic imaging; D001268:Atlanto-Axial Joint / Q000503:physiopathology*; D002574:Cervical Vertebrae / Q000601:surgery; D005260:Female; D005598:Fractures, Spontaneous / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D008875:Middle Aged; D009809:Odontoid Process / Q000293:injuries* / Q000601:surgery; D011859:Radiography; D013123:Spinal Fusion