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International Orthopaedics

Erschienen in:

01.04.2014 | Original Paper

Radiographic quantification of dynamic hip screw migration

verfasst von: Laurent Audigé, Flurin Cagienard, Christoph Martin Sprecher, Norbert Suhm, Marc Andreas Müller

Erschienen in: International Orthopaedics | Ausgabe 4/2014

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Abstract

Purpose

This study aimed to propose a technique to quantify dynamic hip screw (DHS®) migration on serial anteroposterior (AP) radiographs by accounting for femoral rotation and flexion.

Methods

Femoral rotation and flexion were estimated using radiographic projections of the DHS® plate thickness and length, respectively. The method accuracy was evaluated using a synthetic femur fixed with a DHS® and positioned at pre-defined rotation and flexion settings. Standardised measurements of DHS® migration were trigonometrically adjusted for femoral rotation and flexion, and compared with unadjusted estimates in 34 patients.

Results

The mean difference between the estimated and true femoral rotation and flexion values was 1.3° (95 % CI 0.9–1.7°) and −3.0° (95 % CI – 4.2° to −1.9°), respectively. Adjusted measurements of DHS® migration were significantly larger than unadjusted measurements (p = 0.045).

Conclusion

The presented method allows quantification of DHS® migration with adequate bias correction due to femoral rotation and flexion.

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Titel: Radiographic quantification of dynamic hip screw migration
verfasst von: Laurent Audigé
Flurin Cagienard
Christoph Martin Sprecher
Norbert Suhm
Marc Andreas Müller
Publikationsdatum: 01.04.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: International Orthopaedics / Ausgabe 4/2014
Print ISSN: 0341-2695
Elektronische ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-013-2146-4

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