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GJH was defined as a Beighton score\u2009\u2265\u20095. All procedures used a direct anterior approach with proximal femoral osteotomy for exposure and selective femoral shortening at the lesser trochanter level when reduction would otherwise impose excessive neurovascular tension or unacceptable residual leg-length discrepancy (LLD). Radiographic parameters and LLD were assessed. Harris Hip Score (HHS) was recorded preoperatively and at 1, 3, 6, and 12\u00a0months. Longitudinal HHS was analysed using a linear mixed-effects model; effect sizes were quantified by Cohen\u2019s d and partial \u03b7\n                      <jats:sup>2<\/jats:sup>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Fifty-eight patients were included (21 GJH, 37 non-GJH). Postoperative LLD was reduced without a between-group difference. Cup position at 6\u00a0months was similar; femoral offset tended to be higher in GJH (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.057). Femoral shortening distance was smaller in GJH (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). Observed HHS was lower in GJH at 1\u20136\u00a0months (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001) but similar at 12\u00a0months. The linear mixed-effects model (LMM) showed significant time, group, and time\u2009\u00d7\u2009group effects (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). Adjusted between-group differences were largest at 1\u00a0month and progressively diminished, becoming non-significant at 12\u00a0months. One dislocation occurred in the GJH group; no revisions were required.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>In young adults with unilateral Hartofilakidis type C DDH, GJH did not compromise 12-month hip function after THA but was associated with a slower early recovery trajectory, with the largest deficit during the first 1\u20133 postoperative months.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s42836-026-00405-7","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T23:02:29Z","timestamp":1780959749000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Generalized joint hypermobility and functional recovery after THA for unilateral Hartofilakidis type C developmental dysplasia of the hip: a retrospective cohort study"],"prefix":"10.1186","volume":"8","author":[{"given":"Yuhang","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhi","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xingshi","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxin","family":"Xia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Jiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guoyuan","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xifu","family":"Shang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,9]]},"reference":[{"key":"405_CR1","doi-asserted-by":"publisher","first-page":"3284","DOI":"10.1007\/s11999-012-2511-4","volume":"470","author":"T Hogervorst","year":"2012","unstructured":"Hogervorst T, Eilander W, Fikkers JT, Meulenbelt I. 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The study protocol was approved by the Institutional Review Board of the First Affiliated Hospital of the University of Science and Technology of China (Approval No. 2024-RE-436). Written informed consent to participate was obtained from all participants.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Written informed consent for publication of the patient\u2019s clinical details and images was obtained from the patient.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"46"}}