{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,11]],"date-time":"2026-07-11T13:29:59Z","timestamp":1783776599855,"version":"3.55.0"},"reference-count":27,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SPI"],"published-print":{"date-parts":[[2006,11]]},"abstract":"<jats:sec>\n<jats:title>Object<\/jats:title>\n<jats:p>The authors conducted a study to assess the correlation between radiological features and clinical courses in patients with chronic atlantoaxial rotatory fixation (AARF) and to determine diagnostic imaging signs for predicting prognosis.<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>There were 24 patients (eight boys and 16 girls) whose mean age was 7.8 years (range 4\u201314 years) and in whom AARF was diagnosed. The mean follow-up duration was 3.7 years (range 5 weeks\u201312 years). There were two groups of patients: 15 patients who visited the hospital less than 8 weeks after symptom (torticollis) onset comprised the acute group, and nine patients in whom the diagnosis of AARF was established later than 3 months after symptom onset comprised the chronic group. The chronic group was divided into two subgroups: those in whom the closed reduction could be achieved and those in whom it could not. Clinical data and radiographic studies, including plain radiographs and plain and three-dimensional (3D) computed tomography (CT) reconstructions, were reviewed retrospectively.<\/jats:p>\n<jats:p>A deformity of the superior C-2 facet joint was frequently observed in the group of patients with chronic AARF (p &lt; 0.0001). This sign represented a risk factor for recurrent dislocation (p = 0.0003, Fisher exact test). Prominent lateral inclination of C-1 was an impeding factor for reduction of chronic AARF (p &lt; 0.0001, analysis of variance with Fisher post hoc test). Greater than 20\u00b0 of lateral inclination of the atlas indicated an irreducible subluxation (p = 0.0023, Fisher exact test).<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>Both facet joint deformity and lateral inclination observed on 3D CT reconstructions can be useful signs to predict the prognosis and the treatment of choice in patients with chronic AARFs.<\/jats:p><\/jats:sec>","DOI":"10.3171\/spi.2006.5.5.385","type":"journal-article","created":{"date-parts":[[2008,1,24]],"date-time":"2008-01-24T12:21:52Z","timestamp":1201177312000},"page":"385-391","source":"Crossref","is-referenced-by-count":49,"title":["Pathognomonic radiological signs for predicting prognosis in patients with chronic atlantoaxial rotatory fixation"],"prefix":"10.3171","volume":"5","author":[{"given":"Ken","family":"Ishii","sequence":"first","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuhiro","family":"Chiba","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirofumi","family":"Maruiwa","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masaya","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Morio","family":"Matsumoto","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshiaki","family":"Toyama","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery and Musculoskeletal Reconstruction & Regeneration Surgery, School of Medicine, Keio University, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1-0050385","series-title":"J Pediatr Orthop","doi-asserted-by":"publisher","first-page":"631","DOI":"10.1097\/01241398-198609000-00021","article-title":"Chronic atlantoaxial rotatory fixation correction by cervical traction, manipulation, and bracing","volume":"6","year":"1986"},{"key":"b2-0050385","series-title":"Ann Surg","first-page":"9","article-title":"Rotatory dislocation of the atlas","volume":"14","year":"1907"},{"key":"b3-0050385","series-title":"Arch Surg","doi-asserted-by":"publisher","first-page":"297","DOI":"10.1001\/archsurg.1934.01180020129007","article-title":"Atlanto-epistropheal subluxations","volume":"29","year":"1934"},{"key":"b4-0050385","series-title":"J Bone Joint Surg Am","doi-asserted-by":"publisher","first-page":"431","DOI":"10.2106\/00004623-199603000-00016","article-title":"Open reduction of traumatic atlanto-axial rotatory dislocation with use of the extreme lateral approach. 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