Major factors influencing rearfoot external eversion moment during barefoot walking

NewsBot · May 6, 2020

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Major factors influencing rearfoot external eversion moment during barefoot walking
NorioTsujimoto et al
Gait & Posture; 5 May 2020

Highlights
•External eversion moment was composed by moment due to mediolateral and vertical GRF.
•Mediolateral GRF component just after foot contact is related to the moment.
•Mediolateral length between COP and ankle at midstance is related to the moment.
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Background
Excessive rearfoot eversion motion during walking has been considered as a risk factor for lower limb chronic injuries. External moment due to ground reaction force (GRF) is the essential cause by which the rearfoot is passively everted during walking.

Research question
This study aims to identify the key factors influencing the rearfoot external eversion moments due to the GRF during walking.

Methods
From 3-D foot coordinates and GRF data of 29 healthy participants during walking, the rearfoot external eversion moments due to the GRF and factors composing the moment (height of the ankle joint center, mediolateral GRF, mediolateral distance of the center of pressure relative to the ankle joint center in the transverse plane, vertical GRF) were computed.

Results
The mediolateral GRF was a key factor influencing the magnitude of the rearfoot external eversion moment just after foot contact, with which pre-contact medial foot velocity was significantly correlated. During the subsequent support phase, the mediolateral distance of the center of pressure (the application point of the vertical GRF) relative to the ankle joint center was also found to be another determinant of the magnitude of the rearfoot external eversion moment.

Significance
We succeeded in demonstrating the specific factors that most likely explain the magnitude of the rearfoot external eversion moment during initial contact and the subsequent support phase during walking. Based on the findings, specific measures to suppress the rearfoot external eversion moment could be proposed.
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