{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T16:38:45Z","timestamp":1785515925502,"version":"3.56.0"},"reference-count":14,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2022,12,23]],"date-time":"2022-12-23T00:00:00Z","timestamp":1671753600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2022,12,23]],"date-time":"2022-12-23T00:00:00Z","timestamp":1671753600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Orthop Surg Res"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>The shortening length of the lower extremity after the proximal femoral osteotomy is an important issue to be considered in preoperative planning of developmental dysplasia of the hip (DDH) in children. There is still a lack of research on shortening the length of the lower extremities in different proximal femoral osteotomy varus styles. We aimed to verify the relationship between the shortening length after \u201cpoint-to-face\u201d and \u201cface-to-face\u201d varus osteotomy and proposed a formula for calculating the difference in shortening length and verified its feasibility.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Fifty-five children with unilateral DDH were enrolled. The preoperative hip CT data were imported into mimics 21, 3-Matic 10 (Materialise, Leuven, Belgium) for femoral reconstruction and simulated osteotomy, and the difference (<jats:italic>t<\/jats:italic>) was calculated by directly measuring the length of the proximal femur after osteotomy. <jats:italic>d<\/jats:italic>* sin<jats:italic>\u03b8<\/jats:italic> was measured in a three-dimensional environment to calculate the difference in femoral shortening length between the two osteotomy methods (<jats:italic>t<\/jats:italic>').<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The results of the direct measurement method and the formula measurement method are shown in the table; the differences in the results of the femoral shortening length difference were not statistically significant (<jats:italic>P<\/jats:italic>\u2009&gt;\u20090.05). The limits of agreement (95%) of the difference values using Bland\u2013Altman analysis were between \u2212\u20090.50 and 0.46\u00a0mm, with a mean of \u2212\u20090.02\u00a0mm, indicating a high agreement between the two methods. <jats:italic>r<\/jats:italic>\u2009=\u20090.99 (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) for the Pearson correlation analysis between the direct measurement method and the calculated method showed that the two methods were significantly correlated.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>The derived formula can accurately calculate the difference in the shortening length of the proximal femur after \u201cpoint-to-face\u201d and \u201cface-to-face\u201d varus osteotomy in children with DDH, which is suitable for clinical application.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13018-022-03462-1","type":"journal-article","created":{"date-parts":[[2022,12,23]],"date-time":"2022-12-23T11:03:38Z","timestamp":1671793418000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Mathematical calculation of the difference in shortening length after two types of proximal femoral varus and an investigation of their applicable conditions: an own-pair design"],"prefix":"10.1186","volume":"17","author":[{"given":"Jian","family":"Sun","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Cui","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Qu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Lian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,12,23]]},"reference":[{"key":"3462_CR1","doi-asserted-by":"crossref","unstructured":"Schaeffer EK, Study Group I, Mulpuri K. 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In: Hip joint restoration. 2017. p. 747\u201354.","DOI":"10.1007\/978-1-4614-0694-5_76"},{"issue":"8","key":"3462_CR5","doi-asserted-by":"publisher","first-page":"1124","DOI":"10.1302\/0301-620X.96B8.33322","volume":"96-B","author":"N Segaren","year":"2014","unstructured":"Segaren N, Abdul-Jabar HB, Hashemi-Nejad A. The influence of the choice of closing wedge angle on leg length discrepancy after proximal femoral varus osteotomy. Bone Jt J. 2014;96-B(8):1124\u20139.","journal-title":"Bone Jt J"},{"issue":"9","key":"3462_CR6","doi-asserted-by":"publisher","first-page":"615","DOI":"10.5435\/JAAOS-D-15-00154","volume":"24","author":"RF Murphy","year":"2016","unstructured":"Murphy RF, Kim YJ. Surgical management of pediatric developmental dysplasia of the hip. 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Chin J Pediatr Surg. 2019;40(4):351\u20136 ((in Chinese)).","journal-title":"Chin J Pediatr Surg"}],"container-title":["Journal of Orthopaedic Surgery and Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s13018-022-03462-1.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1186\/s13018-022-03462-1\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s13018-022-03462-1.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,12,23]],"date-time":"2022-12-23T11:05:18Z","timestamp":1671793518000},"score":1,"resource":{"primary":{"URL":"https:\/\/josr-online.biomedcentral.com\/articles\/10.1186\/s13018-022-03462-1"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,12,23]]},"references-count":14,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2022,12]]}},"alternative-id":["3462"],"URL":"https:\/\/doi.org\/10.1186\/s13018-022-03462-1","relation":{},"ISSN":["1749-799X"],"issn-type":[{"value":"1749-799X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,12,23]]},"assertion":[{"value":"31 August 2022","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"19 December 2022","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"23 December 2022","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Ethical approval for this study was granted by the Medical Ethics Review Committee of the Fourth Hospital of Harbin Medical University (review number: 2022-SCILLSC-05). All methods were carried out in accordance with relevant guidelines and regulations. Informed consent was obtained in writing from all the individual participants included in the study.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval and consent to participate"}},{"value":"Written informed consent was obtained from all patients for publication of this study and any accompanying images.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"563"}}