AIMS Acetabular retroversion is a recognized cause of hip impingement and can be influenced by pelvic tilt (PT), which changes in different functional positions. Positional changes in PT have not previously been studied in patients with acetabular retroversion. METHODS Supine and standing anteroposterior (AP) pelvic radiographs were retrospectively analyzed in 69 patients treated for symptomatic acetabular retroversion. Measurements were made for acetabular index (AI), lateral centre-edge angle (LCEA), crossover index, ischial spine sign, and posterior wall sign. The change in the angle of PT was measured both by the sacro-femoral-pubic (SFP) angle and the pubic symphysis to sacroiliac (PS-SI) index. RESULTS In the supine position, the mean PT (by SFP) was 1.05° (SD 3.77°), which changed on standing to a PT of 8.64° (SD 5.34°). A significant increase in posterior PT from supine to standing of 7.59° (SD 4.5°; SFP angle) and 5.89° (SD 3.33°; PS-SI index) was calculated (p < 0.001). There was a good correlation in PT change between measurements using SFP angle and PS-SI index (0.901 in the preoperative group and 0.815 in the postoperative group). Signs of retroversion were significantly reduced in standing radiographs compared to supine: crossover index (0.16 (SD 0.16) vs 0.38 (SD 0.15); p < 0.001), crossover sign (19/28 hips vs 28/28 hips; p < 0.001), ischial spine sign (10/28 hips vs 26/28 hips; p < 0.001), and posterior wall sign (12/28 hips vs 24/28 hips; p < 0.001). CONCLUSION Posterior PT increased from supine to standing in patients with symptomatic acetabular retroversion. The features of acetabular retroversion were less evident on standing radiographs. The low PT angle in the supine position is a factor in the increased appearance of acetabular retroversion. Patients presenting with symptoms of hip impingement should be assessed by supine and standing pelvic radiographs to highlight signs of acetabular retroversion, and to assist with optimizing acetabular correction at the time of surgery. Cite this article: Bone Joint J 2022;104-B(7):786-791.

中文翻译：

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有症状的髋臼后倾患者的骨盆从仰卧位倾斜到站立位。

AIMS 髋臼后倾是髋关节撞击的公认原因，并且可能受骨盆倾斜 (PT) 的影响，骨盆倾斜在不同的功能位置发生变化。以前没有在髋臼后倾患者中研究过 PT 的位置变化。方法 回顾性分析 69 名因症状性髋臼后倾接受治疗的患者的仰卧位和站立位前后位 (AP) 骨盆 X 光片。测量了髋臼指数（AI）、外侧中心边缘角（LCEA）、交叉指数、坐骨棘征和后壁征。通过骶-股-耻骨 (SFP) 角和耻骨联合到骶髂 (PS-SI) 指数来测量 PT 角度的变化。结果 仰卧位时，平均 PT（按 SFP）为 1.05°（SD 3.77°），站立时 PT 变为 8.64°（SD 5.34°）。计算出从仰卧位到站立位的后 PT 显着增加 7.59°（SD 4.5°；SFP 角）和 5.89°（SD 3.33°；PS-SI 指数）（p < 0.001）。使用 SFP 角和 PS-SI 指数测量的 PT 变化具有良好的相关性（术前组为 0.901，术后组为 0.815）。与仰卧位相比，站立位 X 光片的后倾迹象显着减少：交叉指数（0.16（SD 0.16）vs 0.38（SD 0.15）；p < 0.001），交叉标志（19/28 髋 vs 28/28 髋；p < 0.001） ，坐骨棘征（10/28 髋 vs 26/28 髋；p < 0.001）和后壁征（12/28 髋 vs 24/28 髋；p < 0.001）。结论 有症状的髋臼后倾患者，从仰卧位到站立位，后路 PT 增加。髋臼后倾的特征在站立位 X 光片上不太明显。仰卧位的低 PT 角是髋臼后倾外观增加的一个因素。出现髋部撞击症状的患者应通过仰卧位和站立位骨盆 X 线片进行评估，以突出髋臼后倾的迹象，并在手术时帮助优化髋臼矫正。引用这篇文章：骨关节 J 2022;104-B(7):786-791。