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European Journal of Trauma and Emergency Surgery
Published in: European Journal of Trauma and Emergency Surgery 3/2023

Open Access 12-12-2022 | Original Article

The ideal site of cement application in cement augmented sacroiliac screw fixation: the biomechanical perspective

Authors: Christoph Emanuel Albers, Ivan Zderic, Philipp Kastner, Boyko Gueorguiev, Theodoros Herkules Tosounidis, Marius Johann Baptist Keel, Johannes Dominik Bastian

Published in: European Journal of Trauma and Emergency Surgery | Issue 3/2023

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Abstract

Purpose

To compare construct stability of cement augmented sacroiliac screws using two different cementation sites in a biomechanical fragility fracture model of the pelvis.

Methods

A fracture model with an incomplete fracture of the sacral ala and complete fracture of the anterior pelvic ring mimicking a FFP IIB fragility fracture of the pelvis was established in five fresh frozen human cadaveric pelvises. Sacral fracture stabilization was achieved with bilateral 7.3 mm fully threaded sacroiliac screws. Cement augmentation was performed at the tip of the screw (body of S1; Group A) on one side, and at the midshaft of the screw (sacral ala; Group B) on the contralateral side. Biomechanical testing was conducted separately on both sides comprising cyclic loading of axial forces transferred through the tested hemipelvis from L5 to the ipsilateral acetabulum. Combined angular displacement in flexion and internal rotation (“gap angle”), angular displacement of the ilium in relation to the screw (“screw tilt ilium”), and screw tip cutout were evaluated.

Results

Relative interfragmentary movements were associated with significantly higher values in group A versus group B for “gap angle” (2.4° vs. 1.4°; p < 0.001), and for “screw tilt ilium” (3.3° vs. 1.4°; p < 0.001), respectively. No significant difference was indicated for screw tip cutout between the two groups (0.6 mm [Group A] vs. 0.8 mm [Group B]; p = 0.376).

Conclusion

The present study demonstrated less fragment and screw displacements in a FFP IIB fracture model under physiologic cyclic loading by cement augmentation of sacroiliac screws at the level of the lateral mass compared to the center of vertebral body of S1.
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Metadata
Title
The ideal site of cement application in cement augmented sacroiliac screw fixation: the biomechanical perspective
Authors
Christoph Emanuel Albers
Ivan Zderic
Philipp Kastner
Boyko Gueorguiev
Theodoros Herkules Tosounidis
Marius Johann Baptist Keel
Johannes Dominik Bastian
Publication date
12-12-2022
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Trauma and Emergency Surgery / Issue 3/2023
Print ISSN: 1863-9933
Electronic ISSN: 1863-9941
DOI
https://doi.org/10.1007/s00068-022-02187-4

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