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Published in: International Orthopaedics 12/2016

Open Access 01-12-2016 | Original Paper

Reliability of measurements performed on two dimensional and three dimensional computed tomography in glenoid assessment for instability

Authors: Anna Maria Kubicka, Jakub Stefaniak, Przemysław Lubiatowski, Jan Długosz, Marcin Dzianach, Marcin Redman, Janusz Piontek, Leszek Romanowski

Published in: International Orthopaedics | Issue 12/2016

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Abstract

Purpose

The main purpose of this study is to establish which of two methods is more reliable in glenoid assessment for instability in pre-operative planning. Accordingly, we have studied the intra- and inter-observer reliability of glenoid parameters with the use of two-dimensional (2D) and three-dimensional (3D) reconstructed computed tomography (CT) images.

Methods

One hundred glenoids were measured with the use of 2D-CT and 3D-CT (in 3D orientation) by two independent observers (one experienced and one inexperienced). Measurements were repeated after one week for 30 randomly selected glenoids.

Results

The intra-class correlation coefficient (ICC) for inter-observer reliability was significantly greater for 3D-CT (0.811 to 0.915) than for 2D-CT (0.523 to 0.925). All intra-observer reliability values for 3D-CT were near perfect (0.835 to 0.997), while those for 2D-CT were less reliable (0.704 to 0.960). A dependent t-test showed that, for both observers, almost all glenoid parameters (except R and d) differed significantly (p < 0.05) between 2D and 3D measurement methods.

Conclusions

Therefore, it can be concluded that 3D glenoid reconstructions are more reliable for glenoid bone loss assessment than 2D-CT. The results suggest that quantifying a glenoid defect with the use of 2D image only—even if performed by an experienced orthopaedic surgeon—is prone to errors. Differences in measurements between and within observers can be explained by plane setting and identifying glenoid rim in 2D-CT. Accordingly, we recommend that glenoid measurements should be performed in 3D orientation using 3D reconstruction obtained from CT images for pre-operative assessments, which are crucial for surgical planning.
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Metadata
Title
Reliability of measurements performed on two dimensional and three dimensional computed tomography in glenoid assessment for instability
Authors
Anna Maria Kubicka
Jakub Stefaniak
Przemysław Lubiatowski
Jan Długosz
Marcin Dzianach
Marcin Redman
Janusz Piontek
Leszek Romanowski
Publication date
01-12-2016
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 12/2016
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-016-3253-9

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