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Published in: Osteoporosis International 6/2018

Open Access 01-06-2018 | Original Article

Diagnosis of vertebral deformities on chest CT and DXA compared to routine lateral thoracic spine X-ray

Authors: M. J. van Dort, E. A. P. M. Romme, F. W. J. M. Smeenk, P. P. P. M. Geusens, E. F. M. Wouters, J. P. van den Bergh

Published in: Osteoporosis International | Issue 6/2018

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Abstract

Summary

X-ray, CT and DXA enable diagnosis of vertebral deformities. For this study, level of agreement of vertebral deformity diagnosis was analysed. We showed that especially on subject level, these imaging techniques could be used for opportunistic screening of vertebral deformities in COPD patients.

Introduction

X-ray and CT are frequently used for pulmonary evaluation in patients with chronic obstructive pulmonary disease (COPD) and also enable to diagnose vertebral deformities together with dual-energy X-ray absorptiometry (DXA) imaging. The aim of this research was to study the level of agreement of these imaging modalities for diagnosis of vertebral deformities from T4 to L1.

Methods

Eighty-seven subjects (mean age of 65; 50 males; 57 COPD patients) who had X-ray, chest CT (CCT) and DXA were included. Evaluable vertebrae were scored twice using SpineAnalyzer™ software. ICCs and kappas were calculated to examine intra-observer variability. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and area under the receiver operating characteristic curve (AUROC) were calculated to compare vertebral deformities diagnosed on the different imaging modalities.

Results

ICCs for height measurements were excellent (> 0.94). Kappas were good to excellent (0.64–0.77). At vertebral level, the AUROC was 0.85 for CCT vs. X-ray, 0.74 for DXA vs. X-ray and 0.77 for DXA vs. CCT. Sensitivity (51%–73%) and PPV (57%–70%) were fair to good; specificity and NPV were excellent (≥ 96%). At subject level, the AUROC values were comparable.

Conclusions

Reproducibility of height measurements of vertebrae is excellent with all three imaging modalities. On subject level, diagnostic performance of CT (PPV 79–82%; NPV 90–93%), and to a slightly lesser extend of DXA (PPV 73–77%; NPV 80–89%), indicates that these imaging techniques could be used for opportunistic screening of vertebral deformities in COPD patients.
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Metadata
Title
Diagnosis of vertebral deformities on chest CT and DXA compared to routine lateral thoracic spine X-ray
Authors
M. J. van Dort
E. A. P. M. Romme
F. W. J. M. Smeenk
P. P. P. M. Geusens
E. F. M. Wouters
J. P. van den Bergh
Publication date
01-06-2018
Publisher
Springer London
Published in
Osteoporosis International / Issue 6/2018
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI
https://doi.org/10.1007/s00198-018-4412-1

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