{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T17:18:41Z","timestamp":1783358321360,"version":"3.54.6"},"reference-count":27,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T00:00:00Z","timestamp":1783296000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T00:00:00Z","timestamp":1783296000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100014584","name":"Universit\u00e4tsmedizin der Johannes Gutenberg-Universit\u00e4t Mainz","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100014584","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Eur J Orthop Surg Traumatol"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>Bipolar hemiarthroplasty (BHA) is widely used for displaced femoral-neck fractures; however postoperative dislocation remains a serious complication. Reported risk factors vary considerably. This study investigated the clinical, surgical and radiographic parameters associated with dislocation following BHA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We conducted a retrospective single\u2011center cohort study of 434 patients who underwent BHA for femoral\u2011neck fractures at a level\u2011I trauma center between 1 January 2016 and 31 December 2020. Demographics, comorbidities, surgical approach (timing and duration), and postoperative radiographs were analyzed. Patients with and without dislocation were compared using univariate analyses. Receiver operating characteristic (ROC) analysis and logistic regression were performed to assess predictive value. In a nested case-control subanalysis, each dislocation case was matched with five age and sex matched controls for detailed comparison analysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The cohort included 165 men and 269 women (mean age 81.9 years); dislocation occurred in 2.5% of patients (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200911). Age, sex, dementia, Parkinson\u2019s disease, time to surgery and operative duration were not associated with dislocation. Operations performed outside daytime hours were more frequent among dislocated cases (45% vs. 20%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.016). Dislocated hips had a smaller center\u2013edge angle (CEA), larger femoral neck-shaft angle (FNSA), reduced contralateral offset and higher bipolar head extrusion index. A CEA\u2009\u2264\u200925\u00b0 predicted dislocation with high specificity but low sensitivity. Logistic regression suggested nighttime surgery as an additional potential predictor.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Pre\u2011operative evaluation of CEA and consideration of operative timing may help identify patients at increased risk of dislocation following BHA. Prospective randomized trials are required to confirm these associations, clarify causality, and develop preventive strategies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00590-026-04853-4","type":"journal-article","created":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T04:47:55Z","timestamp":1783313275000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Risk factors for bipolar hemiarthroplasty dislocation: a retrospective cohort study"],"prefix":"10.1007","volume":"36","author":[{"given":"Andreas","family":"Baranowski","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C\u00e9line","family":"Stahn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erik","family":"Wegner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Schippers","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victoria","family":"Buschmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eren","family":"Demir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Austin","family":"Harper","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ulrike","family":"Ritz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erol","family":"Gercek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Drees","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Nowak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,7,6]]},"reference":[{"key":"4853_CR1","doi-asserted-by":"publisher","first-page":"1064","DOI":"10.1002\/jbmr.4821","volume":"38","author":"CW Sing","year":"2023","unstructured":"Sing CW, Lin TC, Bartholomew S et al (2023) Global Epidemiology of Hip Fractures: Secular Trends in Incidence Rate, Post-Fracture Treatment, and All\u2010Cause Mortality. 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