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Abstract：
BACKGROUND: The effect of Leg-Length Discrepancy (LLD) on dynamic gait parameters has been extensively discussed. Podobarography is the study of foot-to-ground pressure distribution. It has been used to test plantar footprint deviations that could reveal pathology.
OBJECTIVE: The aim of this study is to determine the effects of simulated LLD on dynamic gait parameters measured with a pressure platform in healthy subjects.
METHODS: Thirty-seven healthy subjects participated in observational cross-sectional research. A procedure was performed to capture the dynamic parameters of each participant under five different simulated LLD conditions. Support time, mean pressure, and peak pressure measures were registered on three trials for each foot and LLD level per session. An analysis of variance (ANOVA) test for repeated measures was performed to check for differences between the different simulated LLD levels.
RESULTS: The stance time of the short leg had no significant changes. The stance time of the long leg increased by 3.51% (p < 0.001), mean pressure of the short leg increased by 1.23% (p = 0.005), and decreased by 5.89% in the long leg (p < 0.001). Peak pressure of the short leg decreased by 2.58% (p = 0.031) and the long leg decreased by 12.11% (p < 0.001).
CONCLUSIONS: This study demonstrates that increasing LLD causes an asymmetrical foot-loading pattern, with decreased mean and peak pressure on the longer limb, and consequently an overload on the short side. Furthermore, an increasing LLD causes increased stance time on the long leg.
OBJECTIVE: The aim of this study is to determine the effects of simulated LLD on dynamic gait parameters measured with a pressure platform in healthy subjects.
METHODS: Thirty-seven healthy subjects participated in observational cross-sectional research. A procedure was performed to capture the dynamic parameters of each participant under five different simulated LLD conditions. Support time, mean pressure, and peak pressure measures were registered on three trials for each foot and LLD level per session. An analysis of variance (ANOVA) test for repeated measures was performed to check for differences between the different simulated LLD levels.
RESULTS: The stance time of the short leg had no significant changes. The stance time of the long leg increased by 3.51% (p < 0.001), mean pressure of the short leg increased by 1.23% (p = 0.005), and decreased by 5.89% in the long leg (p < 0.001). Peak pressure of the short leg decreased by 2.58% (p = 0.031) and the long leg decreased by 12.11% (p < 0.001).
CONCLUSIONS: This study demonstrates that increasing LLD causes an asymmetrical foot-loading pattern, with decreased mean and peak pressure on the longer limb, and consequently an overload on the short side. Furthermore, an increasing LLD causes increased stance time on the long leg.
摘要：
背景：腿部长度差异（LLD）对动态步态参数的影响已得到广泛讨论。波次成像是对脚到地面压力分布的研究。它已用于测试可以揭示病理学的足底足迹偏差。
目的：本研究的目的是确定模拟LLD对健康受试者用压力平台测量的动态步态参数的影响。
方法：37名健康受试者参与观察性横断面研究。在五种不同的模拟LLD条件下进行程序以捕获每个参与者的动态参数。支持时间,平均压力，和峰值压力测量记录在3项试验中,每足和每个疗程的LLD水平.进行重复测量的方差分析(ANOVA)测试以检查不同模拟LLD水平之间的差异。
结果：短腿站立时间无明显变化。长腿的站立时间增加了3.51％（p<0.001），短腿的平均压力增加了1.23％（p=0.005），长腿下降5.89%(p<0.001)。短腿的峰值压力降低了2.58％（p=0.031），长腿的峰值压力降低了12.11％（p<0.001）。
结论：这项研究表明，增加LLD会导致不对称的足部负荷模式，随着较长肢平均和峰值压力的降低，因此，短边过载。此外，LLD的增加导致长腿站立时间增加。
目的：本研究的目的是确定模拟LLD对健康受试者用压力平台测量的动态步态参数的影响。
方法：37名健康受试者参与观察性横断面研究。在五种不同的模拟LLD条件下进行程序以捕获每个参与者的动态参数。支持时间,平均压力，和峰值压力测量记录在3项试验中,每足和每个疗程的LLD水平.进行重复测量的方差分析(ANOVA)测试以检查不同模拟LLD水平之间的差异。
结果：短腿站立时间无明显变化。长腿的站立时间增加了3.51％（p<0.001），短腿的平均压力增加了1.23％（p=0.005），长腿下降5.89%(p<0.001)。短腿的峰值压力降低了2.58％（p=0.031），长腿的峰值压力降低了12.11％（p<0.001）。
结论：这项研究表明，增加LLD会导致不对称的足部负荷模式，随着较长肢平均和峰值压力的降低，因此，短边过载。此外，LLD的增加导致长腿站立时间增加。
