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Skeletal Radiology
Published in: Skeletal Radiology 7/2010

01-07-2010 | Scientific Article

Correlation of the cross-over ratio of the cross-over sign on conventional pelvic radiographs with computed tomography retroversion measurements

Authors: Clément M. L. Werner, Carol E. Copeland, Jeff Stromberg, Thomas Ruckstuhl

Published in: Skeletal Radiology | Issue 7/2010

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Abstract

Objective

To find a correlation between the cross-over ratio of the cross-over sign on conventional anteroposterior (AP) pelvic radiographs and retroversion measurements (‘roof-edge angle’ and ‘equatorial-edge angle) on computed tomography (CT) scans. This would facilitate the interpretation of the cross-over sign regarding the amount of acetabular retroversion.

Materials and methods

Correctly projected AP pelvic radiographs (2,925 hips) were examined for the presence of the cross-over sign (COS), and the overlap ratio of the COS was measured. On CT scans of the same patients the ‘roof-edge angle’ (RE angle) and the ‘equatorial-edge angle’ (EE angle) were also calculated.

Results

A statistically significant but only weak relationship could be found between the overlap ratio of the COS and the ‘roof-edge angle’ (P < 0.0001; correlation coefficient −0.486) and between this ratio and the ‘equatorial-edge angle’ (P < 0.0001; correlation coefficient −0.395).

Conclusion

A relationship between the overlap ratio and orientation measurements on CT scans could be found, but it was less strong than expected.
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Metadata
Title
Correlation of the cross-over ratio of the cross-over sign on conventional pelvic radiographs with computed tomography retroversion measurements
Authors
Clément M. L. Werner
Carol E. Copeland
Jeff Stromberg
Thomas Ruckstuhl
Publication date
01-07-2010
Publisher
Springer-Verlag
Published in
Skeletal Radiology / Issue 7/2010
Print ISSN: 0364-2348
Electronic ISSN: 1432-2161
DOI
https://doi.org/10.1007/s00256-009-0854-z

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