Department of Spine Disorders and Orthopaedics, Centre of Postgraduate Medical Education, Gruca Orthopaedic and Trauma Teaching Hospital, Otwock, Poland.
Department of Radiology, Centre of Postgraduate Medical Education, Gruca Orthopaedic and Trauma Teaching Hospital, Otwock, Poland.
Bone Joint J. 2021 Aug;103-B(8):1345-1350. doi: 10.1302/0301-620X.103B8.BJJ-2020-2182.R1.
The aim of the study was to compare two methods of calculating pelvic incidence (PI) and pelvic tilt (PT), either by using the femoral heads or acetabular domes to determine the bicoxofemoral axis, in patients with unilateral or bilateral primary hip osteoarthritis (OA).
PI and PT were measured on standing lateral radiographs of the spine in two groups: 50 patients with unilateral (Group I) and 50 patients with bilateral hip OA (Group II), using the femoral heads or acetabular domes to define the bicoxofemoral axis. Agreement between the methods was determined by intraclass correlation coefficient (ICC) and the standard error of measurement (SEm). The intraobserver reproducibility and interobserver reliability of the two methods were analyzed on 31 radiographs in both groups to calculate ICC and SEm.
In both groups, excellent agreement between the two methods was obtained, with ICC of 0.99 and SEm 0.3° for Group I, and ICC 0.99 and SEm 0.4° for Group II. The intraobserver reproducibility was excellent for both methods in both groups, with an ICC of at least 0.97 and SEm not exceeding 0.8°. The study also revealed excellent interobserver reliability for both methods in both groups, with ICC 0.99 and SEm 0.5° or less.
Either the femoral heads or acetabular domes can be used to define the bicoxofemoral axis on the lateral standing radiographs of the spine for measuring PI and PT in patients with idiopathic unilateral or bilateral hip OA. Cite this article: 2021;103-B(8):1345-1350.
本研究旨在比较两种测量骨盆入射角（PI）和骨盆倾斜角（PT）的方法，即通过使用股骨头或髋臼穹隆来确定双髋关节股骨轴，以评估单侧或双侧原发性髋骨关节炎（OA）患者的骨盆参数。
在两组患者中，使用股骨头或髋臼穹隆来确定双髋关节股骨轴，分别在站立位脊柱侧位 X 线片上测量 PI 和 PT：50 例单侧（I 组）和 50 例双侧髋 OA 患者（II 组）。通过组内相关系数（ICC）和测量标准误差（SEm）来确定两种方法之间的一致性。对两组 31 例 X 线片的两种方法的观察者内可重复性和观察者间可靠性进行分析，以计算 ICC 和 SEm。
在两组患者中，两种方法均获得了极好的一致性，I 组的 ICC 为 0.99，SEm 为 0.3°，II 组的 ICC 为 0.99，SEm 为 0.4°。两种方法在两组患者中的观察者内可重复性均极好，ICC 至少为 0.97，SEm 不超过 0.8°。研究还表明，两种方法在两组患者中的观察者间可靠性均极好，ICC 为 0.99，SEm 为 0.5°或更小。
在特发性单侧或双侧髋 OA 患者的站立位脊柱侧位 X 线片上，使用股骨头或髋臼穹隆都可以用来定义双髋关节股骨轴来测量 PI 和 PT。
2021;103-B(8):1345-1350.
