title: Ossification of the posterior atlantoaxial membrane associated with an os odontoideum: a case report.
abstract: We report a case of ossification of the posterior atlantoaxial membrane associated with an os odontoideum in a 46-year-old woman. She developed myelopathy following a minor motor vehicle accident. The patient underwent posterior atlantoaxial arthrodesis and resection of the ossified lesion and recovered uneventfully. Long-standing atlantoaxial instability might have played a role in ectopic ossification of the posterior atlantoaxial membrane.
authors.affiliation: Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Ohya
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Chikuda
authors.forename: Shurei
authors.initials: S
authors.lastname: Sugita
authors.forename: Takashi
authors.initials: T
authors.lastname: Ono
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Oshima
authors.forename: Katsushi
authors.initials: K
authors.lastname: Takeshita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kawaguchi
authors.forename: Kozo
authors.initials: K
authors.lastname: Nakamura
mesh_terms: D001174:Arthrodesis; D001268:Atlanto-Axial Joint / Q000473:pathology*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000150:complications; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009809:Odontoid Process / Q000473:pathology*; D009999:Ossification, Heterotopic; D013117:Spinal Cord Compression / Q000175:diagnosis / Q000209:etiology; D014057:Tomography, X-Ray Computed