Abstract：
To analyze the changes over time in the strain on the inferior iliofemoral (IIF) ligament when a constant high-force long-axis distraction mobilization (LADM) was applied over 5 minutes.
A cross-sectional laboratory cadaveric study.
Anatomy laboratory.
Thirteen hip joints from 9 fresh-frozen cadavers (mean age, 75.6±7.8 years; N=13).
High-force LADM in open-packed position was sustained for a period of 5 minutes.
Strain on IFF ligament was measured over time with a microminiature differential variable reluctance transducer. Strain measurements were taken at every 15 seconds for the first 3 minutes and every 30 seconds for the next 2 minutes.
Major changes in strain occurred in the first minute of high-force LADM application. The greatest increase in strain on the IFF ligament occurred at the first 15 seconds (7.3±7.2%). At 30 seconds, the increase in strain was 10.1±9.6%, the half of the total increase at the end of the 5-minute high-force LADM (20.2±8.5%). Significant changes in strain measures were shown to occur at 45 seconds of high-force LADM (F=18.11; P<.001).
When a 5-minute high-force LADM was applied, the major changes in the strain on IIF ligament occurred in the first minute of the mobilization. A high-force LADM mobilization should be sustained at least 45 seconds to produce a significant change in the strain of capsular-ligament tissue.
A cross-sectional laboratory cadaveric study.
Anatomy laboratory.
Thirteen hip joints from 9 fresh-frozen cadavers (mean age, 75.6±7.8 years; N=13).
High-force LADM in open-packed position was sustained for a period of 5 minutes.
Strain on IFF ligament was measured over time with a microminiature differential variable reluctance transducer. Strain measurements were taken at every 15 seconds for the first 3 minutes and every 30 seconds for the next 2 minutes.
Major changes in strain occurred in the first minute of high-force LADM application. The greatest increase in strain on the IFF ligament occurred at the first 15 seconds (7.3±7.2%). At 30 seconds, the increase in strain was 10.1±9.6%, the half of the total increase at the end of the 5-minute high-force LADM (20.2±8.5%). Significant changes in strain measures were shown to occur at 45 seconds of high-force LADM (F=18.11; P<.001).
When a 5-minute high-force LADM was applied, the major changes in the strain on IIF ligament occurred in the first minute of the mobilization. A high-force LADM mobilization should be sustained at least 45 seconds to produce a significant change in the strain of capsular-ligament tissue.
摘要：
目的：分析在5分钟内施加恒定的高力长轴牵引动员（LADM）时，下髂股（IIF）韧带上的应变随时间的变化。
方法：一项横断面实验室尸体研究。
方法：解剖学实验室。
方法：来自9具新鲜冷冻尸体的13个髋关节（平均年龄，75.6±7.8年）。
方法:将处于开放包装位置的强力LADM持续5分钟。
方法：使用微型差动可变磁阻传感器随时间测量IFF韧带上的应变。在前3分钟每15s进行应变测量,在接下来的2分钟每30s进行应变测量。
结果：应变的主要变化发生在施加强力LADM的第一分钟。IFF韧带上的应变最大增加发生在前15s（7.3±7.2％）。30多岁时,应变增加10.1±9.6％，5分钟强力LADM结束时总增加的一半（20.2±8.5％）。在高力LADM的45s处显示出应变测量值的显着变化（F=18.11；p<0.001）。
结论：当施加5分钟的强力LADM时，IIF韧带应变的主要变化发生在动员的第一分钟。高力LADM动员应持续至少45s，以产生囊韧带组织应变的显着变化。
方法：一项横断面实验室尸体研究。
方法：解剖学实验室。
方法：来自9具新鲜冷冻尸体的13个髋关节（平均年龄，75.6±7.8年）。
方法:将处于开放包装位置的强力LADM持续5分钟。
方法：使用微型差动可变磁阻传感器随时间测量IFF韧带上的应变。在前3分钟每15s进行应变测量,在接下来的2分钟每30s进行应变测量。
结果：应变的主要变化发生在施加强力LADM的第一分钟。IFF韧带上的应变最大增加发生在前15s（7.3±7.2％）。30多岁时,应变增加10.1±9.6％，5分钟强力LADM结束时总增加的一半（20.2±8.5％）。在高力LADM的45s处显示出应变测量值的显着变化（F=18.11；p<0.001）。
结论：当施加5分钟的强力LADM时，IIF韧带应变的主要变化发生在动员的第一分钟。高力LADM动员应持续至少45s，以产生囊韧带组织应变的显着变化。
