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Surgimap software was employed to measure cervical sagittal parameters including OI, odontoid tilt (OT), C2 slope (C2S), C0-2 angle, C2-7 angle, T1 slope (T1S) and T1S-cervical lordosis (CL). Paired samples t-test was applied to determine the difference between parameters measured by standing X-ray and those by supine MRI. In addition, the statistical correlation between the parameters were compared. The prediction of CL was performed and validated using the formula CL\u2009=\u20090.36\u2009\u00d7\u2009OI\u2009\u2212\u20090.67\u2009\u00d7\u2009OT\u2009\u2212\u20090.69\u2009\u00d7\u2009T1S.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Significant correlations and differences were found between cervical sagittal parameters determined by X-ray and those by MRI. OI was verified to be a constant anatomic parameter and the formula CL\u2009=\u20090.36\u2009\u00d7\u2009OI\u2009\u2212\u20090.67\u2009\u00d7\u2009OT\u2009\u2212\u20090.69\u2009\u00d7\u2009T1S can be used to predict CL in cervical sagittal parameters.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>OI is verified as a constant anatomic parameter, demonstrating the necessity of a combined assessment of cervical sagittal balance by using standing X-ray and supine MRI. The formula CL\u2009=\u20090.36\u2009\u00d7\u2009OI\u2009\u2212\u20090.67\u2009\u00d7\u2009OT\u2009\u2212\u20090.69\u2009\u00d7\u2009T1S can be applied to predict CL in cervical sagittal parameters.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13018-024-04542-0","type":"journal-article","created":{"date-parts":[[2024,1,13]],"date-time":"2024-01-13T09:02:22Z","timestamp":1705136542000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Odontoid incidence: a constant cervical anatomical feature evident in standing plain radiographs and supine magnetic resonance images"],"prefix":"10.1186","volume":"19","author":[{"given":"Longao","family":"Huang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiyou","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongyuan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongyu","family":"Qin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,1,13]]},"reference":[{"issue":"11","key":"4542_CR1","doi-asserted-by":"publisher","first-page":"1142","DOI":"10.1097\/00007632-199011010-00011","volume":"15","author":"K Abumi","year":"1990","unstructured":"Abumi K, Panjabi MM, Kramer KM, Duranceau J, Oxland T, Crisco JJ. 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