Service de radiologie, CHU la Cavale-Blanche, 29609 Brest, France.
Joint Bone Spine. 2013 Jan;80(1):52-6. doi: 10.1016/j.jbspin.2012.02.002. Epub 2012 Mar 23.
Hip dysplasia may cause pain and premature hip osteoarthritis. Here, our objective was to assess the inter- and intraobserver reproducibility of radiographic hip parameter measurement in adults.
We used anteroposterior pelvic radiographs and false-profile lateral hip radiographs from 30 individuals (60 hips) enrolled in a prevalence study of hip osteoarthritis. For each hip, two independent observers recorded five parameters twice, at an interval of 1 month. The five parameters were the vertical-center-edge angle (VCE), the anterior center-edge angle (vertical-center-anterior angle, VCA), the acetabular roof angle (HTE), the neck-shaft angle (CC'D), and acetabulum depth (AD). Reproducibility was assessed using Bland-Altman plots, intraclass correlation coefficients (ICCs), and kappa coefficients for the radiographic diagnosis of hip dysplasia using widely accepted cutoffs.
Of the 60 hips, 51 were assessable. Intraobserver ICC values ranged from 0.72 to 0.94 and interobserver ICC values from 0.68 to 0.84. Kappa coefficients were between 0.60 and 1.00, except for the VCA angle (κ=0.41).
In this study, reproducibility of the main radiographic hip parameters was good according to all evaluation methods used. However, CC'D and, to an even greater extent, the VCA angle seemed challenging to measure.
髋关节发育不良可引起疼痛和髋关节骨关节炎。本研究旨在评估成人髋关节影像学参数测量的观察者内和观察者间的可重复性。
我们使用髋关节骨关节炎患病率研究中的 30 名个体（60 髋）的前后骨盆射线照片和假侧位髋关节射线照片。对于每个髋关节，两名独立观察者在 1 个月的间隔内两次记录五个参数，这五个参数是垂直中心边缘角（VCE）、前中心边缘角（垂直中心前缘角，VCA）、髋臼顶角（HTE）、颈干角（CC'D）和髋臼深度（AD）。使用广泛接受的截点评估髋关节发育不良的放射诊断，使用 Bland-Altman 图、组内相关系数（ICC）和kappa 系数来评估可重复性。
在这 60 个髋关节中，有 51 个髋关节可评估。观察者内 ICC 值范围为 0.72 至 0.94，观察者间 ICC 值范围为 0.68 至 0.84。kappa 系数在 0.60 到 1.00 之间，除了 VCA 角（κ=0.41）。
在这项研究中，根据使用的所有评估方法，主要髋关节影像学参数的重复性良好。然而，CC'D，甚至更重要的是 VCA 角，似乎难以测量。
