The Effect of Simulated Leg-Length Discrepancy on the Dynamic Parameters of the Feet during Gait-Cross-Sectional Research.

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.

PURPOSE: 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.