Agten Christoph A, Jonczy Maciej, Ullrich Oliver, Pfirrmann Christian W A, Sutter Reto, Buck Florian M
Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.
Faculty of Medicine, University of Zurich, Zurich, Switzerland.
Clin Anat. 2017 Jul;30(5):591-598. doi: 10.1002/ca.22874. Epub 2017 Apr 3.
To quantify acetabular version using 3 D reconstructions based on biplanar radiographs (BPR) with CT as reference standard. No institutional review board approval was needed. Nine dry-bone pelvises underwent BPR in five different positions (rotation/tilt). The 3 D models of each pelvis were reconstructed by two radiologists on the basis of anatomical landmarks using semi-automated software. Automated software was used to assess the 3 D models and to calculate acetabular versions perpendicular to the anterior pelvic plane on all levels in the craniocaudal direction in 1 mm steps. Transverse CT images perpendicular to the anterior pelvic plain were reconstructed through the acetabulum in 1 mm steps. Both readers measured acetabular version on each image. Inter-reader agreement was calculated. Measurements based on BPR and CT were compared. Inter-reader agreement was almost perfect for BPR-based acetabular version measurements (ICC (intraclass correlation coefficient) = 0.920, P < 0.0005) and CT (ICC = 0.990, P < 0.0005). Correlation of acetabular versions between the five BPR-positions was substantial/almost perfect (ICC = 0.722-0.887 and 0.749-0.872 for readers 1 and 2, respectively; most P < 0.0005). The acetabular version measurements between the ap-positioning from BPR and CT showed moderate agreement (mean CCC (concordance correlation coefficient) = 0.733 for reader 1, CCC = 0.755 for reader 2). Acetabular version on multiple levels can be measured using BPR and dedicated post-processing software and is relatively independent of pelvic rotation and tilt. Clin. Anat. 30:591-598, 2017. © 2017 Wiley Periodicals, Inc.
以CT作为参考标准，使用基于双平面X线片（BPR）的三维重建来量化髋臼旋转角。无需机构审查委员会批准。九个干燥骨盆在五个不同位置（旋转/倾斜）进行了BPR。两名放射科医生基于解剖标志点，使用半自动软件重建每个骨盆的三维模型。使用自动化软件评估三维模型，并以1毫米步长在颅尾方向的所有层面上计算垂直于骨盆前平面的髋臼旋转角。以1毫米步长通过髋臼重建垂直于骨盆前平面的横向CT图像。两位阅片者在每张图像上测量髋臼旋转角。计算阅片者间的一致性。比较基于BPR和CT的测量结果。基于BPR的髋臼旋转角测量的阅片者间一致性几乎完美（组内相关系数（ICC）=0.920，P<0.0005），基于CT的测量阅片者间一致性也几乎完美（ICC=0.990，P<0.0005）。五个BPR位置之间的髋臼旋转角相关性很强/几乎完美（阅片者1的ICC=0.722 - 0.887，阅片者2的ICC=0.749 - 0.872；大多数P<0.0005）。BPR的前后位定位与CT之间的髋臼旋转角测量显示出中度一致性（阅片者1的平均一致性相关系数（CCC）=0.733，阅片者2的CCC=0.755）。使用BPR和专用后处理软件可以测量多个层面的髋臼旋转角，并且相对独立于骨盆旋转和倾斜。《临床解剖学》30:591 - 598，2017年。©2017威利期刊公司
