{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T23:04:37Z","timestamp":1777676677970,"version":"3.51.4"},"reference-count":35,"publisher":"SAGE Publications","issue":"2_suppl","license":[{"start":{"date-parts":[[2020,12,1]],"date-time":"2020-12-01T00:00:00Z","timestamp":1606780800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["HIP International"],"published-print":{"date-parts":[[2020,12]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction:<\/jats:title>\n                    <jats:p>The aim of this study was to investigate the mechanisms of periprosthetic fractures occurring as a result of a sideways fall in total hip arthroplasty patients, and to compare the predictions of numerical models in terms of load distribution on the implanted femur with clinical data.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and methods:<\/jats:title>\n                    <jats:p>3 numerical models were built: 1 for intact femur and 2 for implanted femur with a straight stem (resembling PBF, Permedica) and with an anatomical stem (resembling ABG II, Stryker). 4 loading configurations were simulated; 1 simulates a vertical load, and 3 simulate a fall with impact on the greater trochanter in different directions. Stress state calculated in the implanted femur was compared for the 2 models with reference to the intact case. These were compared with clinical data collected at a single centre (Istituto Ortopedico Gaetano Pini, Milan, Italy) where 41 patients were investigated after periprosthetic fracture: 26 patients had a straight uncemented stem and 15 an anatomical uncemented stem.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>The maximum calculated strain in compression in the case of ABG II implanted femur was 2 times higher than in the presence of PBF stem in the vertical loading configuration. For configurations of sideways fall, in both models, there was a progressive increase of stress state in the bone with increasing angle. Simulations of sideways fall elicited results in accordance with clinical observations: due to the peculiar stem design and consequent state of stress in the bone, anatomical stems seem to induce trochanteric fractures more frequently, while for straight stems type B fractures are more likely to occur.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>Clinical findings confirmed numerical model predictions: stem design seems to highly influence distribution of stress in the bone and consequent localisation of the fracture site.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/1120700020971312","type":"journal-article","created":{"date-parts":[[2020,12,2]],"date-time":"2020-12-02T04:49:50Z","timestamp":1606884590000},"page":"86-93","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Periprosthetic femoral fractures in sideways fall configuration: comparative numerical analysis of the influence of femoral stem design"],"prefix":"10.1177","volume":"30","author":[{"given":"Massimo","family":"Franceschini","sequence":"first","affiliation":[{"name":"Istituto Ortopedico \u201cG. Pini\u201d \u2013 II, Orthopaedic and Trauma Clinic, Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luigi La","family":"Barbera","sequence":"additional","affiliation":[{"name":"LaBS, Department of Chemistry, Materials and Chemical Engineering \u201cGiulio Natta\u201d, Polytechnic of Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alberto","family":"Anticonome","sequence":"additional","affiliation":[{"name":"LaBS, Department of Chemistry, Materials and Chemical Engineering \u201cGiulio Natta\u201d, Polytechnic of Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Claudia","family":"Ottardi","sequence":"additional","affiliation":[{"name":"LaBS, Department of Chemistry, Materials and Chemical Engineering \u201cGiulio Natta\u201d, Polytechnic of Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Atsuki","family":"Tanaka","sequence":"additional","affiliation":[{"name":"LaBS, Department of Chemistry, Materials and Chemical Engineering \u201cGiulio Natta\u201d, Polytechnic of Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomaso","family":"Villa","sequence":"additional","affiliation":[{"name":"LaBS, Department of Chemistry, Materials and Chemical Engineering \u201cGiulio Natta\u201d, Polytechnic of Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,12,2]]},"reference":[{"key":"bibr1-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2013.01.012"},{"key":"bibr2-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1007\/s002239900679"},{"key":"bibr3-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2009.05.001"},{"key":"bibr4-1120700020971312","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-199503000-00008"},{"key":"bibr5-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1097\/BOT.0b013e3181b5c0c6"},{"key":"bibr6-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2009.05.038"},{"key":"bibr7-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9290(97)00123-1"},{"key":"bibr8-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.bone.2007.08.039"},{"key":"bibr9-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1007\/s10439-010-0196-y"},{"key":"bibr10-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1359\/JBMR.0301247"},{"key":"bibr11-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1007\/s00198-006-0162-6"},{"key":"bibr12-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2011.10.019"},{"key":"bibr13-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9290(12)70352-4"},{"key":"bibr14-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2008.07.001"},{"key":"bibr15-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1115\/1.4025390"},{"key":"bibr16-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1007\/BF01774015"},{"key":"bibr17-1120700020971312","doi-asserted-by":"publisher","DOI":"10.1016\/j.arth.2005.02.001"},{"key":"bibr18-1120700020971312","unstructured":"Soci\u00e9t\u00e9 Fran\u00e7aise de Chirurgie Orthop\u00e9dique at Traumatologique (SoFCOT) Total Hip Arthroplasty Register. 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