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International Orthopaedics
Published in: International Orthopaedics 7/2016

01-07-2016 | Original Paper

Assessment of pelvic injuries treated with ilio-sacral screws: injury severity and accuracy of screw positioning

Authors: Miguel Pishnamaz, Thomas Dienstknecht, Barbara Hoppe, Christina Garving, Henning Lange, Frank Hildebrand, Philipp Kobbe, Hans-Christoph Pape

Published in: International Orthopaedics | Issue 7/2016

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Abstract

Purpose

The aim of this study was to analyse possible indicative parameters for percutaneous ilio-sacral stabilisation and to identify parameters associated with screw misplacement.

Methods

Cohort study, level I trauma centre. Inclusion criteria: (1) unstable pelvic injury, (2) percutaneous ilio-sacral screws placement. Exclusion criteria: (1) sacral dysmorphy, (2) failed closed reduction, (3) navigated techniques. Indicative parameters were age, gender, body mass index, number of screws, screw angulation, fracture type and injury severity. End points were ilio-sacral screw position and associated complications. Screw placement accuracy was graded as follows: grade 0, no perforation; grade 1, perforation <2 mm; grade 2, perforation from 2 to 4 mm; grade 3, ≥4 mm perforation.

Results

Between March 2008 and March 2013, 102 (53 women) patients were included (mean age, 48.5 ± 21.4 years). The Injury Severity Score (ISS) and New Injury Severity Score (NISS) were 18.9 ± 9.9 and 22.3 ± 22.3, respectively. The positions of 137 ilio-sacral screws were analysed. Of all screws, 87.6 % (120) were placed satisfactory (<2 mm perforation). The incidence of screw misplacement was significantly higher in the case of two unilateral S1 screws compared with a single screw (failure rate: two unilateral screws 23.1 % vs single screw 7.0 %; p < 0.05). Screw perforation anterior to the lateral mass (in-out-in) represented the most frequent malposition. Revision was necessary in three cases due to malpositioning. Furthermore, no major complication occurred.

Conclusions

We conclude, that twofold ilio-sacral screw positioning from one side increases the risk for screw misplacement. In this case, alternative techniques like navigation should be considered. Anterior screw perforation represents a common problem with a high incidence and warrants particular attention.
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Metadata
Title
Assessment of pelvic injuries treated with ilio-sacral screws: injury severity and accuracy of screw positioning
Authors
Miguel Pishnamaz
Thomas Dienstknecht
Barbara Hoppe
Christina Garving
Henning Lange
Frank Hildebrand
Philipp Kobbe
Hans-Christoph Pape
Publication date
01-07-2016
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 7/2016
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-015-2933-1

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