Department of Radiology, Changi General Hospital, 2 Simei Street 3, Singapore, 529889, Singapore,
Skeletal Radiol. 2014 Mar;43(3):289-95. doi: 10.1007/s00256-013-1781-6. Epub 2013 Dec 14.
To compare acetabular version angle measurements of CT scans in the prone and reformatted supine positions. CT acetabular version angle measurements have previously been done in the prone position to correct for pelvic tilt. With the advent of multidetector CT, recent studies have evaluated acetabular version angles measured in the supine position. To our knowledge, a comparison between these two approaches has not been performed.
Case series in which consecutive CT urography studies of 49 adult patients performed in both prone and supine positions were retrospectively reviewed, and acetabular version angles of both hips measured.
Retrospective review of 49 consecutive CT urography studies performed in both prone and supine positions was done, and acetabular version angles of both hips were measured. Two radiologists measured the acetabular version angles independently. Multiplanar reformation of the supine CT images was performed to compensate for pelvic tilt and rotation prior to angle measurements.
There was excellent interobserver agreement between the two readers (ICC = 0.90). Acetabular version angle measurements from the prone CT images were larger compared to reformatted supine images (24.0 and 21.3°, respectively, p < 0.0001), with greater angles found in women. There was strong correlation between supine and prone acetabular version angle measurements with a Pearson correlation coefficient of 0.743.
Acetabular version angles measured from prone and reformatted supine CT images show strong correlation but are significantly different with larger angles obtained from the former and in women; clinical implications of these findings may require further study in other to determine the best method of version angle measurement. CT acetabular version angle measurement is also reliable with excellent interobserver correlation.
比较 CT 扫描在俯卧位和重新格式化仰卧位时的髋臼版本角测量值。先前在俯卧位进行 CT 髋臼版本角测量以纠正骨盆倾斜。随着多层 CT 的出现，最近的研究评估了仰卧位测量的髋臼版本角。据我们所知，尚未对这两种方法进行比较。
回顾性病例系列研究，对 49 例连续接受俯卧位和仰卧位 CT 尿路造影检查的成年患者进行回顾性分析，并测量双侧髋关节的髋臼版本角。
对 49 例连续进行俯卧位和仰卧位 CT 尿路造影检查的患者进行回顾性分析，并测量双侧髋关节的髋臼版本角。两位放射科医生独立测量髋臼版本角。在进行角度测量之前，对仰卧位 CT 图像进行多平面重建以补偿骨盆倾斜和旋转。
两位读者之间存在极好的观察者间一致性（ICC=0.90）。与重新格式化的仰卧位图像相比，俯卧位 CT 图像上的髋臼版本角测量值更大（分别为 24.0°和 21.3°，p<0.0001），女性的角度更大。仰卧位和俯卧位髋臼版本角测量值之间存在很强的相关性，Pearson 相关系数为 0.743。
从俯卧位和重新格式化仰卧位 CT 图像上测量的髋臼版本角显示出很强的相关性，但差异显著，前者和女性获得的角度更大；这些发现的临床意义可能需要在其他方面进行进一步研究，以确定测量版本角的最佳方法。CT 髋臼版本角测量也是可靠的，观察者间相关性极好。
