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KMID : 1142420180160020267
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PNF and Movement
2018 Volume.16 No. 2 p.267 ~ p.273
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Effect of Induced Leg Length Discrepancy on the Limitation of Stability and Static Postural Balance
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Han Jin-Tae
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Abstract
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Purpose: Leg length discrepancy (LLD) is one of the risk factors for postural imbalance. This study aimed to investigate the effect of induced leg length discrepancy on the limitation of stability (LOS) and static postural balance.
Methods: Thirteen adults (males, 7; females 6) participated in this study. The LOS and static postural balance [sway length, sway area, and sway velocity of center of gravity (COG) displacement] were measured by the balance trainer system. The subjects were asked to move the COG for the anterior, posterior, and left and right directions maximally and to keep standing on the platform with and without induced LLD for 30 s in the open and closed eyes conditions, respectively. The LLD was artificially induced to 2 cm using insole. Wilcoxon test was used to compare the LOS and the static postural balance between with and without induced LLD.
Results: The anterior and posterior LOS significantly decreased in induced LLD (p<0.05), and the left and right LOS were not significantly different between with and without LLD (p>0.05). Sway length, sway area, and sway velocity of the COG displacement significantly decreased in induced LLD (p<0.05).
Conclusion: This study suggests that induced LLD could decease the antero?posterior LOS and increased the static postural balance. Therefore, the LLD could disturb the postural balance.
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KEYWORD
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Banlance, Center of gravity, Leg length discrepancy, Limitation of stability
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