Auleley G R, Rousselin B, Ayral X, Edouard-Noel R, Dougados M, Ravaud P
Faculté de Médecine Cochin Port-Royal, Paris, France.
Ann Rheum Dis. 1998 Sep;57(9):519-23. doi: 10.1136/ard.57.9.519.
To assess the effect of standing position on joint space width (JSW) measurements of the hips with and without osteoarthritis (OA) on pelvic radiographs.
Adult patients aged 18 or more had pelvic anteroposterior conventional radiographs standing and supine performed by a single radiologist in the same radiology unit according to standardised guidelines. JSW measurements in mm were made by a single reader blind to patients' identity and type of view, using a 0.1 mm graduated magnifying glass directly laid over the radiograph, at the narrowest point for OA hips or at the vertical joint space for non-OA hips. Agreement of JSW between both views was assessed using the Bland and Altman graphical analysis.
JSW was greater on standing than supine radiographs, for example, 7.1% for OA hips. Mean (SD) differences and limits of agreement (mm) between both views were 0.08 (0.27) and -0.46 to 0.62 for the 70 non-OA hips, 0.02 (0.31) and -0.60 to 0.64 for the 46 OA hips. Corresponding 95% confidence intervals of mean difference were 0.02, -0.14 mm and -0.07, -0.11 mm.
Measurements of JSW of the hip on pelvic standing and supine radiographs are concordant. Changes less than or equal to 0.64 mm between the two views are similar or inferior to radiological progression of OA.
评估站立位对骨盆X线片上有无骨关节炎（OA）的髋关节关节间隙宽度（JSW）测量值的影响。
18岁及以上的成年患者在同一放射科由同一位放射科医生按照标准化指南进行站立位和仰卧位骨盆前后位常规X线摄影。由一位对患者身份和检查体位类型不知情的阅片者，使用直接放置在X线片上的0.1mm刻度放大镜，在OA髋关节的最窄点或非OA髋关节的垂直关节间隙处测量以毫米为单位的JSW。使用Bland和Altman图形分析评估两种体位下JSW的一致性。
站立位X线片上的JSW大于仰卧位，例如，OA髋关节的JSW大7.1%。70例非OA髋关节两种体位下的平均（标准差）差值及一致性界限（mm）分别为0.08（0.27）和-0.46至0.62，46例OA髋关节分别为0.02（0.31）和-0.60至0.64。平均差值的相应95%置信区间分别为0.02，-0.14mm和-0.07，-0.11mm。
骨盆站立位和仰卧位X线片上髋关节JSW的测量结果具有一致性。两种体位间变化小于或等于0.64mm的情况与OA的放射学进展相似或更轻。
