Department of Orthopedic Surgery, Faculty of Medicine, Oita University, Yufu City, Japan.
Clin Orthop Surg. 2021 Dec;13(4):461-467. doi: 10.4055/cios20230. Epub 2021 Nov 15.
There is a paucity of studies on the iliac curvature in developmental dysplasia of the hip (DDH). Here, we examined the iliac curvature in DDH using three-dimensional computed tomography.
We allocated cases with a center-edge angle of < 20° to the DDH group (55 cases) and cases with a center-edge angle of > 25° to the control group (57 cases) and measured the straight line (line A) between the anterior and posterior superior iliac spines. We examined which part of the iliac bone line A passes through and classified the results into 4 categories (type A, inside the iliac bone; type B, through the iliac bone; type C, outside the iliac bone; and type D, both inside and outside the iliac bone) to evaluate the iliac wing curvature. After measuring the area and internal surface of the iliac wing using line A, we examined the correlation between these values, the interspinous distance, the superior iliac angle, and the center-edge angle.
Distributions of the four types were compared between the two groups; there was no significant difference. The length of the portion of line A inside the ilium and the area formed by line A and the iliac wing, which shows the degree of iliac wing curvature, were not significantly different between the groups. There were no correlations between these values and the center-edge angle; however, there were weak positive correlations among the interspinous distance, the superior iliac angle, and the center-edge angle.
The inward nature of the iliac bone in patients with DDH is mainly due to the internal rotation of the entire iliac bone and less likely due to the curvature of the iliac bone.
发育性髋关节发育不良（DDH）患者的髂骨曲度研究较少。本研究采用三维 CT 检查探讨 DDH 患者的髂骨曲度。
将中心边缘角＜20°的患者归入 DDH 组（55 例），中心边缘角＞25°的归入对照组（57 例），测量髂前上棘和髂后上棘的直线（线 A）。检查线 A 通过髂骨的哪一部分，并将结果分为 4 型（A 型，在髂骨内；B 型，穿过髂骨；C 型，在髂骨外；D 型，在髂骨内外），评估髂翼曲度。用线 A 测量髂骨翼的面积和内表面后，分析这些值与髂棘间距离、髂骨上缘角和中心边缘角的相关性。
两组间 4 型的分布无显著差异。线 A 内的髂骨段长度和线 A 与髂骨翼围成的面积（反映髂骨翼曲度）在两组间无显著差异。这些值与中心边缘角无相关性，但髂棘间距离、髂骨上缘角和中心边缘角之间存在弱正相关。
DDH 患者髂骨内陷主要是由于整个髂骨的内旋，而不是髂骨曲度所致。
