{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T10:21:45Z","timestamp":1785320505877,"version":"3.55.0"},"reference-count":16,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SPI"],"published-print":{"date-parts":[[2009,7]]},"abstract":"<jats:sec>\n<jats:title>Object<\/jats:title>\n<jats:p>The authors' experience with treatment of 8 patients with \u201cvertical mobile and reducible\u201d atlantoaxial dislocation is reviewed. The probable pathogenesis, radiological and clinical features, and management issues in such cases are discussed.<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>Between January 2006 and March 2008, 8 patients who presented with vertical mobile and reducible atlantoaxial dislocations were treated at the Department of Neurosurgery at King Edward Memorial Hospital in Mumbai, India. The vertical atlantoaxial dislocation\/basilar invagination reduced completely on extension of the neck, with no need of any cervical traction. According to the extent of superior migration of the odontoid process, and measurements based on the vertical atlantoaxial instability index, the dislocation was graded as mild, moderate, or severe. All patients were treated using the C-1 lateral mass and C-2 pars plate and screw method of fixation.<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>The study group was composed of 5 male and 3 female patients (mean age 24 years, age range 8\u201354 years). All patients presented with the physical features of short neck, torticollis, pain in the nape of the neck, and varying degrees of quadriparesis. In 6 patients there was a history of trauma prior to the onset of major neurological symptoms. The dislocation was mild in 3 cases, moderate in 1, and severe in 4. All patients had clinical neurological improvement following surgery. The follow-up duration ranged from 4 to 30 months (mean 18 months).<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>Vertical mobile and reducible atlantoaxial dislocation is a discrete clinical entity. Abnormal inclination and incompetence of the facet joint appears to be the primary causative factor that resulted in vertical dislocation or basilar invagination. Posterior fixation in the reduced dislocation position forms the basis of treatment.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2009.3.spine08927","type":"journal-article","created":{"date-parts":[[2009,7,1]],"date-time":"2009-07-01T17:28:30Z","timestamp":1246469310000},"page":"9-14","source":"Crossref","is-referenced-by-count":70,"title":["Vertical mobile and reducible atlantoaxial dislocation"],"prefix":"10.3171","volume":"11","author":[{"given":"Atul","family":"Goel","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abhidha","family":"Shah","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanjay","family":"Rajan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1-0110009","series-title":"Yale J Biol Med","first-page":"487","article-title":"Basilar impression (platybasia). A bizarre developmental anomaly of the occipital bone and upper cervical spine with striking and misleading neurologic manifestations","volume":"11","author":"Chamberlain","year":"1939"},{"key":"b2-0110009","series-title":"Clin Neurosurg","first-page":"389","article-title":"Anterior approaches to lesions of the upper cervical spine","volume":"34","author":"Crockard","year":"1988"},{"key":"b3-0110009","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"525","DOI":"10.3171\/jns.1992.77.4.0525","article-title":"The influence of transoral odontoid resection on stability of the craniovertebral junction","volume":"77","author":"Dickman","year":"1992"},{"key":"b4-0110009","series-title":"J Neurosurg Spine","doi-asserted-by":"publisher","first-page":"281","DOI":"10.3171\/spi.2004.1.3.0281","article-title":"Treatment of basilar invagination by atlantoaxial joint distraction and direct lateral mass fixation","volume":"1","author":"Goel","year":"2004"},{"key":"b5-0110009","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"962","DOI":"10.3171\/jns.1998.88.6.0962","article-title":"Basilar invagination: a study based on 190 surgically treated cases","volume":"88","author":"Goel","year":"1998"},{"key":"b6-0110009","series-title":"Neurosurgery","doi-asserted-by":"publisher","first-page":"1351","DOI":"10.1097\/00006123-200212000-00004","article-title":"Atlantoaxial fixation using plate and screw method: a report of 160 treated patients","volume":"51","author":"Goel","year":"2002"},{"key":"b7-0110009","series-title":"Acta Neurochir (Wien)","doi-asserted-by":"publisher","first-page":"47","DOI":"10.1007\/BF01400872","article-title":"Plate and screw fixation for atlanto-axial dislocation. (Technical report)","volume":"129","author":"Goel","year":"1994"},{"key":"b8-0110009","series-title":"Arch Path Anat Physiol","doi-asserted-by":"publisher","first-page":"449","DOI":"10.1007\/BF01949233","article-title":"Beitrag zur Lehre von der basilaren Impression des Schadels","volume":"80","author":"Grawitz","year":"1880"},{"key":"b9-0110009","series-title":"Fortschr Rontgenstr","first-page":"460","article-title":"Rontgendiagnostik der platybasic und basilar Impression","volume":"86","author":"Klaus","year":"1957"},{"key":"b10-0110009","series-title":"Neurol India","doi-asserted-by":"publisher","first-page":"6","DOI":"10.4103\/0028-3886.30416","article-title":"Transatlantic odonto-occipital listhesis: the so-called basilar invagination","volume":"55","author":"Kothari","year":"2007"},{"key":"b11-0110009","series-title":"J Spinal Disord Tech","doi-asserted-by":"publisher","first-page":"4","DOI":"10.1097\/BSD.0b013e31804856d7","article-title":"Vertical Atlantoaxial Index: A new craniovertebral radiographic index","volume":"21","author":"Kulkarni","year":"2008"},{"key":"b12-0110009","series-title":"Acta Radiol","doi-asserted-by":"publisher","first-page":"335","DOI":"10.3109\/00016925309176595","article-title":"Bony abnormalities in the region of foramen magnum: correlation of anatomic and neurologic findings","volume":"40","author":"McRae","year":"1953"},{"key":"b13-0110009","series-title":"Pediatr Neurosurg","doi-asserted-by":"publisher","first-page":"260","DOI":"10.1159\/000120969","article-title":"Primary craniovertebral anomalies and hindbrain herniation syndrome (Chiari I): data base analysis","volume":"23","author":"Menezes","year":"1995"},{"key":"b14-0110009","series-title":"J Radiol Electrol Med Nucl","first-page":"1","article-title":"[New median sagittal pneumostratigraphical finding concerning the posterior fossa.]","volume":"42","author":"Thiebaut","year":"1961"},{"key":"b15-0110009","series-title":"The Craniovertebral Junction and Its Abnormalities","first-page":"29","author":"VanGilder","year":"1987"},{"key":"b16-0110009","series-title":"The Upper Cervical Spine: Regional Anatomy, Pathology, and Traumatology. A Systematic Radiological Atlas and Textbook","first-page":"1","author":"Von Torklus","year":"1972"}],"container-title":["Journal of Neurosurgery: Spine"],"original-title":[],"link":[{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/11\/1\/article-p9.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-spine\/11\/1\/article-p9.xml","content-type":"text\/html","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-spine\/11\/1\/article-p9.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,4,15]],"date-time":"2023-04-15T21:30:28Z","timestamp":1681594228000},"score":1,"resource":{"primary":{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/11\/1\/article-p9.xml"}},"subtitle":["Clinical article"],"short-title":[],"issued":{"date-parts":[[2009,7]]},"references-count":16,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.3171\/2009.3.spine08927","relation":{},"ISSN":["1547-5654"],"issn-type":[{"value":"1547-5654","type":"print"}],"subject":[],"published":{"date-parts":[[2009,7]]}}}