Abstract：
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, p < 0.001), average stiffness (mean difference: 63.7 N/mm, p = 0.016), and total energy (mean difference: 82.3 mJ, p = 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, p < 0.001) and total energy (mean difference: 72.9 mJ, p = 0.007). In flexion, the deficient state displayed a significant decrease in peak distraction force relative to contols (mean difference: 7.1 N, p = 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.
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, p < 0.001), average stiffness (mean difference: 63.7 N/mm, p = 0.016), and total energy (mean difference: 82.3 mJ, p = 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, p < 0.001) and total energy (mean difference: 72.9 mJ, p = 0.007). In flexion, the deficient state displayed a significant decrease in peak distraction force relative to contols (mean difference: 7.1 N, p = 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.
摘要：
背景：髋关节的抽吸密封在保持髋关节稳定性方面起着重要作用；但是，圆韧带在维持这种密封方面的功能仍然知之甚少。这项研究旨在评估在步态过程中发生的关节位置中，圆柱状韧带不足的髋关节抽吸密封的有效性。
方法:解剖六个新鲜冷冻的人尸体臀部并安装到Instron材料测试系统上。分析每个样本的平均峰值牵张力，刚度,和髋关节移位时的总能量。测试是在天然完整的韧带圆状态和缺乏的韧带圆状态下进行的。在20°屈曲中检查样本，中性,和10°的延伸。
结果：在中立位置，韧带缺乏状态显示峰值牵张力显着降低（平均差：33.2N，p<0.001)，平均刚度(平均差:63.7N/mm,p=0.016),和总能量(平均差：82.3mJ，p=0.022）与完整对照相比。在延伸中，缺乏状态表现出峰值牵张力的显着降低（平均差：42.8N，p<0.001)和总能量(平均差：72.9mJ，p=0.007)。在屈曲中，缺乏状态显示出峰值牵张力相对于控制的显着下降（平均差：7.1N，p=0.003)。
结论：圆柱状韧带在保持髋部吸力密封方面发挥着重要作用，当髋关节处于神经对齐或伸展状态时，其效果最为突出。研究结果表明，圆韧带缺乏可能是临床上相关的治疗目标。
方法:解剖六个新鲜冷冻的人尸体臀部并安装到Instron材料测试系统上。分析每个样本的平均峰值牵张力，刚度,和髋关节移位时的总能量。测试是在天然完整的韧带圆状态和缺乏的韧带圆状态下进行的。在20°屈曲中检查样本，中性,和10°的延伸。
结果：在中立位置，韧带缺乏状态显示峰值牵张力显着降低（平均差：33.2N，p<0.001)，平均刚度(平均差:63.7N/mm,p=0.016),和总能量(平均差：82.3mJ，p=0.022）与完整对照相比。在延伸中，缺乏状态表现出峰值牵张力的显着降低（平均差：42.8N，p<0.001)和总能量(平均差：72.9mJ，p=0.007)。在屈曲中，缺乏状态显示出峰值牵张力相对于控制的显着下降（平均差：7.1N，p=0.003)。
结论：圆柱状韧带在保持髋部吸力密封方面发挥着重要作用，当髋关节处于神经对齐或伸展状态时，其效果最为突出。研究结果表明，圆韧带缺乏可能是临床上相关的治疗目标。
