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Erschienen in:
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
Erschienen in: Skeletal Radiology | Ausgabe 7/2010
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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.