Anterior supra-acetabular external fixation for tile C1 pelvic fractures: a digital anatomical study and a finite elemen
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ORIGINAL ARTICLE
Anterior supra‑acetabular external fixation for tile C1 pelvic fractures: a digital anatomical study and a finite element analysis Tan Shan1 · Liang Anlin1 · Yang Mingming1 · Yang Haitao2 · Zhang Anwei1 · Gao Shichang1 Received: 7 May 2020 / Accepted: 26 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Objective Investigating the anatomical characteristics of supra-acetabular screw corridor as well as comparing the biomechanical stability between semi- and full-length screw external fixations for Tile C1 pelvic fractures. Methods 50 male and 50 female uninjured pelvic CT data were converted into three-dimensional models and the supraacetabular corridors were reconstructed by the Mimics software. The horizontal slice was redefined passing through the bilateral anterior inferior iliac spine and bilateral posterior superior iliac spine at the same time. On every horizontal slices, a 5 mm diameter virtual screw was placed along with the unilateral anterior narrowing to posterior narrowing of the supraacetabular corridor, and the relevant parameters of the semi- and full-length screw fixations were measured from inferior to superior at an interval height of 2.5 mm until the width of the corridor was less than 5 mm. Thus, the insertion position was located, as well as the inclination angle ranges were measured. The same procedure was done on a bilateral supra-acetabular corridor for each patient. Last, a Tile C1 pelvic finite element model was simulated and fixed with either semi- or a full-length anterior supra-acetabular external fixator. A 500 N loading was tested on the model with three directions (cranial–caudal, anterior–posterior and lateral–medial) and the stiffness was determined by the max displacements. Results The insertion points of supra-acetabular screw for 66% (66/100) of men and 78% (78/100) of women were located at the outer lower part of the anterior inferior iliac spine (AIIS) (p
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