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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2018 | Research article

A guideline for placement of an infra-acetabular screw based on anatomic landmarks via an intra-pelvic approach

Authors: Florian Baumann, Paul Schmitz, Daniel Mahr, Maximilian Kerschbaum, Axel Gänsslen, Michael Nerlich, Michael Worlicek

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2018

Abstract

Background

Due to demographic changes, more and more fracture patterns involving anterior acetabular structures occur. The infra-acetabular screw is seen a useful tool to increase stability in fixation of the acetabular cup. However, the exact position of this screw in relation to anatomic landmarks which are intra-operatively palpable via an intra-pelvic approach has not yet been determined.

Methods

This biomorphometric experimental study references the ideal screw position of an infra-acetabular screw to anatomic landmarks palpable via an intra-pelvic approach. Therefore, we created a computer tomography-based 3D-model of 40 patients (20 women, 20 men) who received a computer tomography (CT) scan of the pelvis for any other reason than an acetabular fracture.

Results

The entry point of an ideal infra-acetabular was of high constancy. At mean, this point was 10.2 mm caudal and 10.4 mm medial of the ilio-pubic/ilio-pectineal eminence. This reference is independent of age, gender, or physical dimensions. However, we found gender-dependent differences for the angulation and the length of the screw.

Conclusions

This study provides a comprehensive guideline to determine the ideal entry point for an infra-acetabular screw via an intra-pelvic approach. The entry point is located 10.2 mm caudal and 10.4 mm medial of the ilio-pubic/ilio-pectineal eminence.

Trial registration

Clinical Trial Registry University of Regensburg Z-2017-0930-1. Registered 04. Dec 2017.

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Title: A guideline for placement of an infra-acetabular screw based on anatomic landmarks via an intra-pelvic approach
Authors: Florian Baumann
Paul Schmitz
Daniel Mahr
Maximilian Kerschbaum
Axel Gänsslen
Michael Nerlich
Michael Worlicek
Publication date: 01-12-2018
Publisher: BioMed Central
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2018
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-018-0786-1

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Springer Medicine

A guideline for placement of an infra-acetabular screw based on anatomic landmarks via an intra-pelvic approach

Abstract

Background

Methods

Results

Conclusions

Trial registration

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

Trial registration

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