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22.03.2019 | Musculoskeletal

Acetabular coverage differs between standing and supine positions: model-based assessment of low-dose biplanar radiographs and comparison with CT

verfasst von: Benjamin Fritz, Christoph A. Agten, Franca K. Boldt, Patrick O. Zingg, Christian W. A. Pfirrmann, Reto Sutter

Erschienen in: European Radiology | Ausgabe 10/2019

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Abstract

Objectives

To evaluate the feasibility of 2D and 3D acetabular coverage assessments based on low-dose biplanar radiographs (BPR) in comparison with CT, and to demonstrate the influence of weight-bearing position (WBP) on anterior and posterior acetabular coverages.

Methods

Fifty patients (21 females, 29 males) underwent standing BPR and supine CT of the pelvis. Using dedicated software, BPR-based calculations of anterior and posterior 2D coverages and anterior, posterior, and global 3D coverages were performed in standardized anterior pelvic plane (APP) and WBP. CT-based anterior and posterior 2D coverages and global 3D coverage was calculated in APP and compared with BPR-based data. Statistics included intraclass correlation coefficients (ICC) and Bland-Altman plots.

Results

Mean anterior 2D coverage was 21.2% (standard deviation, ± 7.4%) for BPR and 23.8% (± 8.4%) for CT (p = 0.226). Mean posterior 2D coverage was 54.2% (± 9.8%) for BPR and 61.7% (± 9.7%) for CT (p = 0.001). Mean global 3D coverage was 46.5% (± 3.0%) for BPR and 45.6% (± 3.6%) for CT (p = 0.215). The inter-method reliability between CT and BPR and inter-reader reliability for BPR-based measurements were very good for all measurement (all ICC > 0.8). Based on BPR, mean anterior and posterior 3D coverages were 20.5% and 26.0% in WBP and APP, while 25 patients increased anterior and 24 patients increased posterior 3D coverage from APP to WBP with a relative change of coverage of up to 11.9% and 10.0%, respectively.

Conclusions

2D and 3D acetabular coverages can be calculated with very good reliability based on BPR. The impact of standing position on acetabular coverage can be quantified with BPR on an individual basis.

Key Points

• 2D and 3D acetabular coverages can be calculated with very good reliability based on biplanar radiographs in comparison with CT.

• The impact of standing position on anterior and posterior acetabular coverages can be quantified with BPR on an individual basis.

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Titel: Acetabular coverage differs between standing and supine positions: model-based assessment of low-dose biplanar radiographs and comparison with CT
verfasst von: Benjamin Fritz
Christoph A. Agten
Franca K. Boldt
Patrick O. Zingg
Christian W. A. Pfirrmann
Reto Sutter
Publikationsdatum: 22.03.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 10/2019
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-019-06136-5

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Acetabular coverage differs between standing and supine positions: model-based assessment of low-dose biplanar radiographs and comparison with CT

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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Objectives

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Conclusions

Key Points

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