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A finite element model of a Tile C pelvic ring injury (unilateral longitudinal sacral fracture and ipsilateral pubic fracture) was constructed. The pelvis was fixed with iliac crest external fixator (IC), anterior inferior iliac spine external fixator (AIIS), combination of IC and AIIS, combination of anterior superior iliac spine external fixator (ASIS) and AIIS, and S1 sacroiliac screw in 5 types of models. The stability indices of the anterior and posterior pelvic rings under vertical longitudinal load, left\u2013right compression load and anterior\u2013posterior shear load were quantified and compared. In the simulated bipedal standing position, the results of the vertical displacement of the midpoint on the upper surface of the sacrum are consistent with the displacement of the posterior rotation angle, and the order from largest to smallest is IC, AIIS, ASIS\u2009+\u2009AIIS, IC\u2009+\u2009AIIS and S1 screw. The longitudinal displacement of IC is greater than that of the other models. The displacements of ASIS\u2009+\u2009AIIS and IC\u2009+\u2009AIIS are similar and the latter is smaller. In the simulated semi-recumbent position, the vertical displacement and posterior rotation angle displacement of the midpoint on the upper surface of the sacrum are also consistent, ranking from large to small: IC, AIIS, ASIS\u2009+\u2009AIIS, IC\u2009+\u2009AIIS and S1 screw. Under the simulated left\u2013right compression load state, the lateral displacements of the highest point of the lateral sacral fracture end are consistent with the highest point of the lateral pubic fracture end, and the order from large to small is S1 screw, IC, AIIS, ASIS\u2009+\u2009AIIS and IC\u2009+\u2009AIIS, among which the displacements of S1 screw and IC are larger, and the displacements of ASIS\u2009+\u2009AIIS and IC\u2009+\u2009AIIS are similar and smaller than those of other models. The displacements of IC\u2009+\u2009AIIS are smaller than those of ASIS\u2009+\u2009AIIS. Under the simulated anterior\u2013posterior shear load condition, the posterior displacements of the highest point of the lateral sacral fracture end and the highest point of the lateral pubic fracture end are also consistent, ranking from large to small: IC, AIIS, ASIS\u2009+\u2009AIIS, IC\u2009+\u2009AIIS and S1 screw. Among them, the displacements of IC and AIIS are larger. The displacements of ASIS\u2009+\u2009AIIS and IC\u2009+\u2009AIIS are similar and the latter are smaller. For the unstable pelvic injury represented by Tile C pelvic fracture, the biomechanical various stabilities of the combination of IC and AIIS are superior to those of the external fixators of conventional configurations. The biomechanical stabilities of the combination of ASIS and AIIS are also better than those of the external fixators of conventional configurations, and slightly worse than those of the combination of IC and AIIS. Compared with sacroiliac screw and conventional external fixators, the lateral stabilities of IC\u2009+\u2009AIIS and ASIS\u2009+\u2009AIIS are particularly prominent.<\/jats:p>","DOI":"10.1038\/s41598-024-60341-x","type":"journal-article","created":{"date-parts":[[2024,4,25]],"date-time":"2024-04-25T17:03:11Z","timestamp":1714064591000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Biomechanical comparative study on external fixators of new configurations in the treatment of Tile C pelvic injury"],"prefix":"10.1038","volume":"14","author":[{"given":"Yong","family":"Zhao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yupeng","family":"Ma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Lian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenliang","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenkang","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,4,25]]},"reference":[{"key":"60341_CR1","doi-asserted-by":"publisher","first-page":"380","DOI":"10.1097\/TA.0b013e3182ab0cde","volume":"76","author":"H Yoshihara","year":"2014","unstructured":"Yoshihara, H. & Yoneoka, D. 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