The suction seal of the hip plays an important role in maintaining hip stability; however, the function of the ligamentum teres in maintaining this seal remains poorly understood. This study aimed to evaluate the effectiveness of the hip suction seal in ligamentum teres deficient hips for joint positions occurring during gait. Six fresh-frozen human cadaveric hips were dissected and mounted to an Instron materials test system. Each specimen was analyzed for average peak distraction force, stiffness, and total energy during hip displacement. Testing was performed in the native intact ligamentum teres state and the deficient ligamentum teres state. Specimens were examined in 20° of flexion, neutral, and 10° of extension. In the neutral position, the ligamentum teres deficient state displayed a significant decrease in peak distraction force (mean difference: 33.2 N, < 0.001), average stiffness (mean difference: 63.7 N/mm, = 0.016), and total energy (mean difference: 82.3 mJ, = 0.022) compared to the intact controls. In extension, the deficient state exhibited a significant decrease in peak distraction force (mean difference: 42.8 N, < 0.001) and total energy (mean difference: 72.9 mJ, = 0.007). In flexion, the deficient state displayed a significant decrease in peak distraction force relative to contols (mean difference: 7.1 N, = 0.003). The ligamentum teres plays a significant role in maintaining the suction seal of the hip, with its effect being most prominent when the hip is in neural alignment or in extension. The findings suggest that ligamentum teres deficiency may be a relevant treatment target in the clinical setting.

中文翻译：

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圆韧带对髋部流体密封的贡献：生物力学研究

髋部的吸力密封对于维持髋部稳定性具有重要作用；然而，人们对圆韧带维持这种密封的功能仍知之甚少。本研究旨在评估髋部吸力密封在圆韧带缺陷的髋部中对步态过程中关节位置的有效性。解剖了六个新鲜冷冻的人类尸体髋关节，并将其安装到英斯特朗材料测试系统上。分析每个样本的平均峰值牵引力、刚度和髋关节移位期间的总能量。测试在天然完整圆韧带状态和缺陷圆韧带状态下进行。样本在 20° 弯曲、中立和 10° 伸展下进行检查。在中立位置，圆韧带缺陷状态显示峰值牵引力（平均差：33.2 N，< 0.001）、平均刚度（平均差：63.7 N/mm，= 0.016）和总能量（平均差）显着下降：82.3 mJ，= 0.022）与完整对照相比。在伸展过程中，缺陷状态表现出峰值牵引力（平均差：42.8 N，< 0.001）和总能量（平均差：72.9 mJ，= 0.007）显着下降。在屈曲时，缺陷状态显示峰值分心力相对于对照组显着降低（平均差：7.1 N，= 0.003）。圆韧带在维持髋部吸力密封方面发挥着重要作用，当髋部处于神经排列或伸展状态时，其作用最为突出。研究结果表明，圆韧带缺陷可能是临床环境中的相关治疗目标。