Introduction

Variations in osseous, neural and muscular anatomical structures in the gluteal region have been investigated for their role in causing deep gluteal pain syndromes including piriformis syndrome. This study aimed to radiologically determine whether the femoral neck–shaft angle (NSA) in piriformis syndrome differs from that in a healthy population.

Methods

Two groups of participants comprising 23 piriformis syndrome patients and 22 healthy controls were included in the present study. Piriformis syndrome was diagnosed based on clinical findings and the diagnosis was confirmed by intramuscular local anaesthetic injection. Femoral NSAs were measured from the anteroposterior pelvic radiographs and compared between the control and piriformis syndrome-affected groups.

Results

The age, height, body weight, body mass index and gender distribution differences between the two groups (control and piriformis) were not statistically significant. The femur NSA was significantly lower in the piriformis group than in the control group. The receiver operating characteristic analysis revealed that the area under the curve, sensitivity and specificity for predicting the risk of piriformis syndrome (PS) were 0.946%, 100% and 86.36%, respectively, at an NSA cut-off of 127°.

Conclusions

Reduced femoral NSA is related to PS. However, studies with a larger study sample are needed to further substantiate this finding.

中文翻译：

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梨状肌综合征股骨颈-干角的放射学比较：病例对照研究

介绍

人们已经研究了臀部区域的骨骼、神经和肌肉解剖结构的变化在引起包括梨状肌综合征在内的深部臀部疼痛综合征中的作用。本研究旨在通过放射学方法确定梨状肌综合征的股骨颈干角 (NSA) 是否与健康人群的不同。

方法

本研究纳入了两组参与者，其中包括 23 名梨状肌综合征患者和 22 名健康对照者。根据临床表现诊断为梨状肌综合征，并通过肌内局麻药注射确诊。通过骨盆前后位 X 线片测量股骨 NSA，并在对照组和梨状肌综合征影响组之间进行比较。

结果

两组（对照组和梨状肌组）年龄、身高、体重、体重指数和性别分布差异无统计学意义。梨状肌组股骨 NSA 显着低于对照组。受试者工作特征分析显示，在 NSA 截止值为 127° 时，预测梨状肌综合征 (PS) 风险的曲线下面积、敏感性和特异性分别为 0.946%、100% 和 86.36%。

结论

股骨 NSA 减少与 PS 相关。然而，需要更大样本的研究来进一步证实这一发现。