Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Arch Orthop Trauma Surg. 2012 May;132(5):591-8. doi: 10.1007/s00402-012-1463-1. Epub 2012 Jan 25.
Joint space width (JSW) of hip joints on radiographs in normal population may vary by related factors, but previous investigations were insufficient due to limitations of sources of radiographs, inclusion of subjects with osteoarthritis, and manual measurement techniques. We investigated influential factors on JSW using semiautomatic computational software on pelvic radiographs in asymptomatic subjects without radiological osteoarthritic findings.
Global and local JSW at the medial, middle, and lateral compartments, and the hip structural parameters were measured in asymptomatic, normal 150 cases (300 hips), using a customized computational software.
Reliability of measurement in global and local JSWs was high with intraobserver reproducibility (intraclass correlation coefficient) ranging from 0.957 to 0.993 and interobserver reproducibility ranging from 0.925 to 0.985. There were significant differences among three local JSWs, with the largest JSW at the lateral compartment. Global and medial local JSWs were significantly larger in the right hip, and global, medial and middle local JSWs were significantly smaller in women. Global and local JSWs were inversely correlated with CE angle and positively correlated with horizontal distance of the head center, but not correlated with body mass index in men and women. They were positively correlated with age and inversely correlated with vertical distance of the head center only in men.
There were interindividual variations of JSW in normal population, depending on sites of the weight-bearing area, side, gender, age, and hip structural parameters. For accurate diagnosis and assessment of hip osteoarthritis, consideration of those influential factors other than degenerative change is important.
在正常人群的 X 光片中，髋关节的关节间隙宽度（JSW）可能因相关因素而有所不同，但由于 X 光片来源、包括骨关节炎患者以及手动测量技术的限制，以前的研究结果并不充分。我们使用无症状受试者无放射学骨关节炎发现的骨盆 X 光片上的半自动计算软件，研究了 JSW 的影响因素。
使用定制的计算软件，对 150 例无症状、正常的受试者（300 髋）的内侧、中间和外侧关节的 JSW 进行了全局和局部测量，并测量了髋关节结构参数。
全局和局部 JSW 的测量可靠性较高，观察者内重复性（组内相关系数）为 0.957 至 0.993，观察者间重复性为 0.925 至 0.985。三个局部 JSW 之间存在显著差异，外侧关节的 JSW 最大。右侧髋关节的全局和内侧局部 JSW 明显较大，女性的全局、内侧和中间局部 JSW 明显较小。全局和局部 JSW 与 CE 角呈负相关，与头中心的水平距离呈正相关，但男性和女性的 JSW 与体重指数无关。仅在男性中，JSW 与年龄呈正相关，与头中心的垂直距离呈负相关。
在正常人群中，JSW 存在个体差异，这取决于承重区域的部位、侧别、性别、年龄和髋关节结构参数。为了准确诊断和评估髋关节骨关节炎，除了退行性改变外，考虑这些影响因素很重要。
