Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A.; Instituto Brasil de Tecnologias da Saúde (IBTS), Rio de Janeiro, Brazil.
Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, Illinois, U.S.A.
Arthroscopy. 2020 Nov;36(11):2843-2848. doi: 10.1016/j.arthro.2020.07.009. Epub 2020 Jul 28.
To to assess whether there are any significant differences in hip joint space width (JSW) between weight-bearing versus supine pelvic radiographs.
Standing and supine anteroposterior pelvic radiographs of 86 patients (146 hips) were included. Sample size was sufficiently powered to assess for equivalence between standing and supine films for JSW measurements made at the medial, lateral, and central aspects of the sourcil line. Measurements were made by 2 independent reviewers blinded to patient positioning. Each reviewer repeated a subset of the measurements to assess intra-rater reproducibility. Mean differences in joint space measurements between standing and supine radiographs were reported for each point of the sourcil. Intraclass correlation coefficients (ICCs) for inter and intra-rater reliability were also calculated.
There were no significant differences between JSW measurements made on standing and supine pelvic radiographs (P = .468). Furthermore, equivalence testing demonstrated statistical equivalence between standing and supine JSW measurements made based on an equivalence threshold of ±0.5 mm. Inter-rater reliability demonstrated good agreement with an overall ICC of 0.775 (95% confidence interval [CI] 0.734-0.809). Intra-rater reliability also demonstrated good agreement with ICCs of 0.84 (95% CI 0.758-0.889) and 0.798 (95% CI 0.721-0.851) for the 2 reviewers, respectively.
JSW measurements on standing and supine pelvic radiographs were not significantly different, and their inter-rater agreement and intra-rater reproducibility demonstrated good reliability and repeatability. Therefore, either may be used to assess JSW, including measurements that may impact treatment decisions for hip arthroscopy.
Level III; retrospective comparative study.
评估负重位与仰卧位骨盆前后位片在髋关节间隙宽度（JSW）方面是否存在显著差异。
纳入 86 例患者（146 髋）的站立位和仰卧位骨盆前后位片。样本量足以评估站立位和仰卧位 JSW 测量值在 sourcil 线内侧、外侧和中央部位的等效性。由 2 位独立的观察者进行测量，观察者对患者的定位情况不知情。每位观察者重复测量一部分，以评估内部观察者的可重复性。报告了在 sourcil 各点处站立位和仰卧位 X 线片上关节间隙测量值的平均差异。还计算了内部和外部观察者之间的组内相关系数（ICC）。
站立位和仰卧位骨盆 X 线片上的 JSW 测量值之间无显著差异（P=0.468）。此外，等效性检验表明，基于±0.5mm 的等效性阈值，站立位和仰卧位 JSW 测量值具有统计学等效性。内部观察者间的可靠性显示出良好的一致性，总 ICC 为 0.775（95%置信区间 [CI] 0.734-0.809）。内部观察者的可靠性也显示出良好的一致性，2 位观察者的 ICC 分别为 0.84（95% CI 0.758-0.889）和 0.798（95% CI 0.721-0.851）。
站立位和仰卧位骨盆 X 线片上的 JSW 测量值无显著差异，其内部观察者间的一致性和内部观察者的可重复性显示出良好的可靠性和可重复性。因此，两种方法均可用于评估 JSW，包括可能影响髋关节镜治疗决策的测量值。
III 级；回顾性比较研究。
