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Biomechanical comparisons between cephalomedullary nails (CMNs) and dynamic hip screws (DHSs) under torsion loading are lacking. This study compared the biomechanical performance of three fixations for basicervical femoral neck fractures under torsion load during early ambulation.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>The biomechanical study models used three fixations: a DHS, a DHS with an anti-rotation screw, and a short CMN. Finite element analysis was used to simulate hip rotation with muscle forces related to leg swing applied to the femur. The equivalent von Mises stress (EQV) on fixation, fragment displacement, and strain energy density at the proximal cancellous bone were monitored for fixation stability.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The EQV of the short CMN construct (304.63\u00a0MPa) was comparable to that of the titanium DHS construct (293.39\u00a0MPa) and greater than that of the titanium DHS with an anti-rotation screw construct (200.94\u00a0MPa). The proximal fragment displacement in the short CMN construct was approximately 0.13\u00a0mm, the greatest among the constructs. The risk of screw cutout for the lag screw in short CMNs was 3.1\u20135.8 times greater than that for DHSs and DHSs with anti-rotation screw constructs.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Titanium DHS combined with an anti-rotation screw provided lower fragment displacement, stress, and strain energy density in the femoral head than the other fixations under torsion load. Basicervical femoral neck fracture treated with CMNs may increase the risk of lag screw cutout.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Graphical abstract<\/jats:title>\n                \n              <\/jats:sec>","DOI":"10.1186\/s13018-024-04842-5","type":"journal-article","created":{"date-parts":[[2024,6,22]],"date-time":"2024-06-22T17:02:01Z","timestamp":1719075721000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Torsional stability of fixation methods in basicervical femoral neck fractures: a biomechanical study"],"prefix":"10.1186","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4941-2685","authenticated-orcid":false,"given":"Chantas","family":"Mahaisavariya","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8349-9446","authenticated-orcid":false,"given":"Surasak","family":"Jitprapaikulsarn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Banchong","family":"Mahaisavariya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1386-5885","authenticated-orcid":false,"given":"Nattapon","family":"Chantarapanich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,6,22]]},"reference":[{"issue":"13","key":"4842_CR1","doi-asserted-by":"publisher","first-page":"1097","DOI":"10.2106\/JBJS.15.01093","volume":"98","author":"ST Watson","year":"2016","unstructured":"Watson ST, Schaller TM, Tanner SL, Adams JD, Jeray KJ. 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