{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T07:49:25Z","timestamp":1777880965558,"version":"3.51.4"},"reference-count":18,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T00:00:00Z","timestamp":1567296000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["81572217"],"award-info":[{"award-number":["81572217"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Orthop Surg (Hong Kong)"],"published-print":{"date-parts":[[2019,9,1]]},"abstract":"<jats:sec>\n                    <jats:title>Objective:<\/jats:title>\n                    <jats:p>The purpose of this study was to evaluate the feasibility of posterior occipital condyle screw (OCS) placement analysis of the safe trajectory area for screw insertion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>Computed tomographic angiography scans of patients (46 males and 27 females) with normal occipitocervical structures were obtained consecutively. Vertebral artery (VA)-occiput distance &lt;4.0 mm was defined as \u201cunfeasible\u201d for OCS fixation, and occipital-atlas angulation was measured to assess the feasibility of screw placement. Next, the placement of 3.5 mm diameter OCS was simulated, the probability of breach of structures surrounding occipital condyles was calculated, and placement parameters were analyzed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>OCS placement was feasible in 91.1% (133\/146) of occipital condyles, and the feasible probability also presented a significant sex-related difference: The probability was higher for males than for females (95.7% vs. 83.3%, p &lt; 0.05). The incidence of anatomical structures injured under screw placement limitation was 18.8% (VA), 81.2% (hypoglossal canal), 59.4% (occipital-atlas joint), and 40.6% (occiput bone surface). There were no significant differences between the left and right condyles in relation to the measured parameters ( p &gt; 0.05). The screw range of motion was significantly smaller in females than in males ( p &lt; 0.05). The feasibility of OCS placement and OCS range of motion were significantly greater in the kyphosis group (&gt;5\u00b0) than in the other two groups ( p &lt; 0.05).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>OCS placement is a feasible technique for occipital-cervical fusion. The male group and occipitocervical region kyphosis group had a wider available space for OCS placement. Tangent angulation may be useful for the accurate and safe placement of an OCS.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/2309499019879540","type":"journal-article","created":{"date-parts":[[2019,10,23]],"date-time":"2019-10-23T22:56:57Z","timestamp":1571871417000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Safe trajectory for an occipital condyle screw: A computer simulation study"],"prefix":"10.1177","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9855-8245","authenticated-orcid":false,"given":"Zhen-Qi","family":"Lou","sequence":"first","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"},{"name":"School of Medicine, Ningbo University, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ding-Li","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"},{"name":"School of Medicine, Ningbo University, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guo-Qing","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei-Hu","family":"Ma","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chao-Yue","family":"Ruan","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hua-Guo","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery, Ningbo No.6 Hospital, Ningbo, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2019,10,23]]},"reference":[{"key":"bibr1-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1097\/BSD.0b013e31816d655e"},{"key":"bibr2-2309499019879540","doi-asserted-by":"publisher","DOI":"10.3171\/SPI.2008.9.10.347"},{"key":"bibr3-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1227\/01.NEU.0000349207.98394.FA"},{"key":"bibr4-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1097\/BSD.0b013e31825bfeea"},{"key":"bibr5-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1007\/s00586-011-1765-y"},{"key":"bibr6-2309499019879540","doi-asserted-by":"publisher","DOI":"10.3171\/2009.11.SPINE09172"},{"key":"bibr7-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e31821fcdfe"},{"key":"bibr8-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1097\/BSD.0b013e31824e52a6"},{"key":"bibr9-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e3181c16f9a"},{"key":"bibr10-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1016\/j.spinee.2011.01.021"},{"key":"bibr11-2309499019879540","doi-asserted-by":"publisher","DOI":"10.3171\/2011.5.SPINE10778"},{"key":"bibr12-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1007\/s007760050013"},{"key":"bibr13-2309499019879540","doi-asserted-by":"publisher","DOI":"10.1016\/j.injury.2005.06.014"},{"key":"bibr14-2309499019879540","first-page":"E205","volume":"40","author":"Benke 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