Janzen D L, Aippersbach S E, Munk P L, Sallomi D F, Garbuz D, Werier J, Duncan C P
Department of Radiology, Vancouver Hospital and Health Sciences Centre, and University of British Columbia, Canada.
Skeletal Radiol. 1998 Jul;27(7):352-8. doi: 10.1007/s002560050397.
To assess a three-dimensional computed tomography (3DCT) technique for measurement of acetabular coverage in adults.
We used 3DCT to define the geometric centre of the femoral head and to measure centre-edge angles (CEAs) at 10 degrees rotational increments around the acetabular rim. The means, ranges, standard deviations and 95% confidence intervals for the CEAs at the various rotational increments were determined. Inter- and intra-observer variability was measured. The normal values are compared with two example cases of acetabular dysplasia.
The normal hips of 15 subjects aged 1949 years (mean 34.2 years) were measured.
The 3DCT measurements are reproducible (mean difference interobserver, 1.7 degrees - 7.9 degrees; mean difference intra-observer, 0.6 degrees-6.9 degrees). Mean normal CEA at the lateral rim was 33 degrees with a 95% confidence interval of 23 degrees - 43 degrees. Mean normal CEAs at 10 rotational increments from anterior to posterior rim were determined, and graphed as a 'normal curve'.
This new 3DCT method of assessing acetabular dysplasia is simple, reproducible, and applicable to diagnosis, quantification and surgical planning for adult acetabular dysplasia patients.
评估一种用于测量成人髋臼覆盖度的三维计算机断层扫描（3DCT）技术。
我们使用3DCT来确定股骨头的几何中心，并以围绕髋臼边缘每10度旋转增量的方式测量中心边缘角（CEA）。确定了各个旋转增量处CEA的均值、范围、标准差和95%置信区间。测量了观察者间和观察者内的变异性。将正常值与两个髋臼发育不良的示例病例进行比较。
对15名年龄在19至49岁（平均34.2岁）的受试者的正常髋关节进行了测量。
3DCT测量结果具有可重复性（观察者间平均差异为1.7度至7.9度；观察者内平均差异为0.6度至6.9度）。外侧边缘的平均正常CEA为33度，95%置信区间为23度至43度。确定了从前边缘到后边缘每10度旋转增量处的平均正常CEA，并绘制成“正常曲线”。
这种评估髋臼发育不良的新3DCT方法简单、可重复，适用于成人髋臼发育不良患者的诊断、量化和手术规划。
