Department of Orthopaedics, Uniklinik Balgrist, University of Zurich, Zurich, Switzerland.
Skeletal Radiol. 2010 Jul;39(7):655-60. doi: 10.1007/s00256-009-0854-z. Epub 2010 Jan 8.
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.
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.
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).
A relationship between the overlap ratio and orientation measurements on CT scans could be found, but it was less strong than expected.
在常规前后位（AP）骨盆 X 线片上的交叉征交叉比与 CT 扫描上的反转测量值（“顶缘角”和“赤道缘角”）之间寻找相关性。这将有助于解释交叉征与髋臼反转量之间的关系。
检查了正确投影的 AP 骨盆 X 线片（2925 髋），以确定交叉征（COS）的存在，并测量 COS 的重叠比。在同一患者的 CT 扫描上，还计算了“顶缘角”（RE 角）和“赤道缘角”（EE 角）。
COS 的重叠比与“顶缘角”（P<0.0001；相关系数-0.486）和与“赤道缘角”（P<0.0001；相关系数-0.395）之间存在统计学上显著但仅较弱的关系。
在 CT 扫描上的重叠比和方位测量之间可以找到相关性，但比预期的要弱。
