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KMID : 1142420220200010059
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PNF and Movement
2022 Volume.20 No. 1 p.59 ~ p.66
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Relationship between 3D Ground Reaction Force and Leg Length Discrepancy during Gait among Standing Workers
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Kim Yong-Wook
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Abstract
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Purpose: The aim of this research was to verify the relationship between three-dimensional (3D) ground reaction force(GRF) and severity of leg length discrepancy (LLD) while walking at a normal speed. It used a 3D motion analysissystem with force platforms in standing workers with LLD.
Methods: Subjects comprising 45 standing workers with LLD were selected. Two force platforms were used to acquire3D GRF data based on a motion analysis system during gait. Vicon Nexus and Visual3D v6 Professional software wereused to analyze kinetic GRF data. The subjects were asked to walk on a walkway with 40 infrared reflective markersattached to their lower extremities to collect 3D GRF data.
Results: The results indicated the maximal force in the posterior and lateral direction of the long limb occurring inthe early stance phase during gait had significant positive correlation with LLD severity (r = 0.664∼0.738, p <0.01).
In addition, the maximal force medial direction of the long limb occurring in the late stance phase showed a highlypositive correlation with the LLD measurement (r = 0.527, p <0.01).
Conclusion: Our results indicate that greater measured LLD severity results in more plantar pressure occurring in thefoot area during heel contact to loading response of the stance phase and the stance push-off period during gait.
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KEYWORD
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Ground reaction force, Leg length discrepancy, Standing worker
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