PURPOSE To noninvasively characterize the ligament strain in the hip capsule using a novel CT-based imaging technique. METHODS The superior iliofemoral ligament (SIFL), inferior iliofemoral ligament (IIFL), ischiofemoral ligament (IFL) and pubofemoral ligament (PFL) were identified and beaded in seven cadavers. Specimens were mounted on a joint motion simulator within an O-arm CT scanner in - 15°, 0°, 30°, 60°, and 90° of flexion. 3 Nm of internal rotation (IR) and external rotation (ER) were applied and CT scans obtained. Strains were calculated by comparing bead separation in loaded and unloaded conditions. Repeated-measures ANOVA was used to evaluate differences in strain within ligaments between hip positions. RESULTS For the SIFL, strain significantly decreased in IR at 30° (p = 0.045) and 60° (p = 0.043) versus 0°. For ER, there were no significant position-specific changes in strain (n.s.). For the IIFL, strain decreased in IR and increased in ER with no significant position-specific differences. For the IFL, strain increased with IR and decreased with ER with no significant position-specific differences. Finally, in the PFL there was a significant flexion angle-by-load interaction (p < 0.001; ES = 0.566), with peak strains noted at 60˚, however pair-wise comparisons failed to identify significant differences between positions (n.s.). Strain decreased in ER, with no significant position-specific differences. CONCLUSION The SIFL and IIFL limit hip external rotation with greater effect in higher flexion angles, while the IFL and PFL limit hip internal rotation. Following hip arthroscopy, consideration should be given to restricting external rotation as traditional capsulotomies cause injury to the SIFL and IIFL.

中文翻译：

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髋关节囊张力取决于韧带位置和施加的旋转力在韧带之间变化。

目的使用一种新颖的基于CT的成像技术来无创地表征髋关节囊膜中的韧带应变。方法鉴定了7只尸体的上li股韧带（SIFL），下股韧带（IIFL），等股股韧带（IFL）和耻骨股韧带（PFL）。将样本安装在O型臂CT扫描仪内的关节运动模拟器上，屈曲度为-15°，0°，30°，60°和90°。施加3 Nm的内部旋转（IR）和外部旋转（ER），并获得CT扫描。通过比较在有载和无载条件下的珠粒分离来计算菌株。重复测量方差分析用于评估髋关节位置之间韧带应变的差异。结果对于SIFL，相对于0°，在30°（p = 0.045）和60°（p = 0.043）时IR的应变显着降低。对于ER，应变（ns）没有明显的位置特异性变化。对于IIFL，IR的应变降低而ER的应变升高，而位置特异性无明显差异。对于IFL，应变随IR升高而随ER降低而无明显的位置特异性差异。最后，在PFL中，存在显着的屈曲-负荷相互作用（p <0.001; ES = 0.566），峰值应变在60°，但是成对比较未能发现位置之间的显着差异（ns）。ER的应变降低，没有明显的位置差异。结论SIFL和IIFL在较高的屈曲角度限制髋关节的外部旋转，而IFL和PFL则限制髋关节的内部旋转。髋关节镜检查后