title: Posterior atlantoaxial subluxation due to os odontoideum combined with cervical spondylotic myelopathy: a case report.
abstract: In patients with os odontoideum and posterior atlantoaxial subluxation are extremely rare. No reports have described posterior atlantoaxial subluxation associated with os odontoideum combined with cervical spondylotic canal stenosis, both of which require surgical treatment. We report one case of a 75-year-old female who underwent arthrodesis between the occiput and C3 using a hook-and-rod system and also a double-door laminoplasty from levels C3 to C7. The claw mechanism was applied between the C2 lamina and the C3 inferior articular process. The posterior atlantoaxial subluxation was completely reduced by the method that the rod gradually pushed the posterior arch of C1 anteriorly during connection to the occiput. Twelve months after surgery, the patient showed improvement in preoperative clumsiness and gait disturbance, and the latest plain radiographs showed solid osseous fusion, with no loss of correction or instrumentation failure.
authors: Department of Orthopaedic Surgery, Saitama Medical Center, Saitama Medical University, 1981, Tsujido, Kamoda, Kawagoe, Saitama, 350-8550, Japan. tmotosuneya@yahoo.co.jp
authors: Takao
authors: T
authors: Motosuneya
authors: Shigeru
authors: S
authors: Hirabayashi
authors: Hironobu
authors: H
authors: Yamada
authors: Yousuke
authors: Y
authors: Kobayashi
authors: Shigeki
authors: S
authors: Sekiya
authors: Hiroya
authors: H
authors: Sakai
mesh_terms: D000368:Aged; D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology*; D019299:Decompression, Surgical / Q000295:instrumentation / Q000379:methods; D005260:Female; D020233:Gait Disorders, Neurologic / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology; D006801:Humans; D016268:Internal Fixators; D004204:Joint Dislocations / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D007796:Laminectomy / Q000295:instrumentation / Q000379:methods; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods; D009809:Odontoid Process / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology; D013117:Spinal Cord Compression / Q000150:complications* / Q000473:pathology / Q000601:surgery; D013123:Spinal Fusion / Q000295:instrumentation / Q000379:methods; D013130:Spinal Stenosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D055009:Spondylosis / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome