{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T00:27:35Z","timestamp":1776299255358,"version":"3.50.1"},"reference-count":34,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T00:00:00Z","timestamp":1618358400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T00:00:00Z","timestamp":1618358400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Foundation of Liaoning Province Education Department\u00a0(Shenyang Medical College 2019)."}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Orthop Surg Res"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Accurate femoral neck anteversion angle (FNA) measurement is of great significance in the diagnosis and treatment of developmental dysplasia of the hip (DDH) in children. The FNA measurement still remains a controversy. We aimed to verify the accuracy of our CT method by 3D printing technology and to evaluate its clinical value.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Sixty-eight children with unilateral DDH were enrolled, and their FNA was measured using 2D-CT and 3D-CT, respectively, by three observers. This procedure was repeated 3 months later. The above measurement outcomes were then compared with the results in the 3D-printed femur (3D-PF) model. The FNA in the 3D-PF model was measured by three observers (two radiologists and one orthopedist; all were professors) collectively through electronic angle instrument.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The primary measurement of FNA at the affected hips by 2D-CT was 44.0 \u00b1 6.1, 49.5 \u00b1 8.9, and 52.8 \u00b1 7.9\u00b0, respectively. On the 3D-CT, it was 47.6 \u00b1 5.4, 49.3 \u00b1 6.8, and 48.6 \u00b1 6.2\u00b0. Three months later, the FNA on 2D-CT was 49.3 \u00b1 10.5, 42.8 \u00b1 7.4, and 45.1 \u00b1 9.3\u00b0, and it was 48.0 \u00b1 6.5, 48.9 \u00b1 7.2, and 49.0 \u00b1 5.7\u00b0 on 3D-CT, respectively. The FNA in the 3D-PF model at the affected and unaffected hips was 48.5 \u00b1 6.6 and 36.9 \u00b1 13.1\u00b0. There were significant differences between 2D-CT and 3D-PF measurements, but no significant difference was found between 3D-CT and 3D-PF measurements. The results by 2D-CT showed significant differences among groups and between the groups. However, the results by 3D-CT had no significant differences among groups or between the groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The results of our study showed that 3D-CT is a more precise, and reproducible method for FNA measurement in DDH. The FNA at the affected hips is 11.6\u00b0 larger than the unaffected in DDH children aged 3\u20138 years.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13018-021-02400-x","type":"journal-article","created":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T06:04:21Z","timestamp":1618380261000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Accuracy of CT for measuring femoral neck anteversion in children with developmental dislocation of the hip verified using 3D printing technology"],"prefix":"10.1186","volume":"16","author":[{"given":"Zhencun","family":"Cai","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chengzhe","family":"Piao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tianyu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lianyong","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liangbi","family":"Xiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,4,14]]},"reference":[{"issue":"7","key":"2400_CR1","doi-asserted-by":"publisher","first-page":"1243","DOI":"10.1016\/j.otsr.2020.09.004","volume":"106","author":"F Canavese","year":"2020","unstructured":"Canavese F, Casta\u00f1eda P, Hui J, Li LY, Li YQ, Roposch A. 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