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Skeletal Radiology
Published in: Skeletal Radiology 6/2016

01-06-2016 | Scientific Article

Comparison of 2D radiography and a semi-automatic CT-based 3D method for measuring change in dorsal angulation over time in distal radius fractures

Authors: Albert Christersson, Johan Nysjö, Lars Berglund, Filip Malmberg, Ida-Maria Sintorn, Ingela Nyström, Sune Larsson

Published in: Skeletal Radiology | Issue 6/2016

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Abstract

Objective

The aim of the present study was to compare the reliability and agreement between a computer tomography-based method (CT) and digitalised 2D radiographs (XR) when measuring change in dorsal angulation over time in distal radius fractures.

Materials and methods

Radiographs from 33 distal radius fractures treated with external fixation were retrospectively analysed. All fractures had been examined using both XR and CT at six times over 6 months postoperatively. The changes in dorsal angulation between the first reference images and the following examinations in every patient were calculated from 133 follow-up measurements by two assessors and repeated at two different time points. The measurements were analysed using Bland–Altman plots, comparing intra- and inter-observer agreement within and between XR and CT.

Results

The mean differences in intra- and inter-observer measurements for XR, CT, and between XR and CT were close to zero, implying equal validity. The average intra- and inter-observer limits of agreement for XR, CT, and between XR and CT were ± 4.4°, ± 1.9° and ± 6.8° respectively.

Conclusions

For scientific purpose, the reliability of XR seems unacceptably low when measuring changes in dorsal angulation in distal radius fractures, whereas the reliability for the semi-automatic CT-based method was higher and is therefore preferable when a more precise method is requested.
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Metadata
Title
Comparison of 2D radiography and a semi-automatic CT-based 3D method for measuring change in dorsal angulation over time in distal radius fractures
Authors
Albert Christersson
Johan Nysjö
Lars Berglund
Filip Malmberg
Ida-Maria Sintorn
Ingela Nyström
Sune Larsson
Publication date
01-06-2016
Publisher
Springer Berlin Heidelberg
Published in
Skeletal Radiology / Issue 6/2016
Print ISSN: 0364-2348
Electronic ISSN: 1432-2161
DOI
https://doi.org/10.1007/s00256-016-2350-6

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