Foot eversion moment during the stance phase of running in non-rearfoot strikers

NewsBot · Jan 30, 2019

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Mechanical factors affecting the foot eversion moment during the stance phase of running in non-rearfoot strikers.
Tsujimoto N et al
Sports Biomech. 2019 Jan 29:1-14

This study aimed to identify the primary factors that induce rearfoot external eversion moments due to ground reaction force (GRF) in non-rearfoot strikers. The data were compared with those of rearfoot strikers. Totally, 11 healthy males who were habitually non-rearfoot strikers ran barefoot. Rearfoot external eversion/inversion moments due to GRF (Mtot) were decomposed into two components based on mediolateral (Mxy) and vertical (Mz) GRFs. The height of the ankle joint centre and the mediolateral distance from the centre of pressure (COP) to the ankle joint centre (a_cop) were calculated as the lever arms to the Mxy and Mz components. Just after foot contact, non-rearfoot strikers demonstrated a significantly larger Mz, which was strongly dependent on a_cop and produced most of the Mtot, whereas Mxy dominated Mtot in rearfoot strikers. During the consecutive loading phase, non-rearfoot strikers demonstrated a significantly larger Mxy, which was strongly dependent on the mediolateral GRF and substantially contributed to Mtot, unlike the rearfoot strikers, whose Mtot was almost dominated by Mz during the loading phase. It was found that since the factor of generating the moment differs depending on the foot contact pattern, the strategies for suppressing the moment may be different for each foot contact pattern.
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NewsBot · Jan 17, 2024

Evaluation of a Method to Estimate Foot Eversion Moments During the Support Phase of Running
Norio Tsujimoto
J Am Podiatr Med Assoc. 2023 Sep-Oct;113(5):21-068

Background: Excessive external eversion moments acting on the ankle derived from the ground reaction force (GRF) during the support phase of running are considered a risk factor for overuse lower-limb injuries. The external eversion moment is considered to be dominated by the moment derived from the vertical GRF. However, no studies have directly evaluated the accuracy with which external eversion moment can be estimated with this information. Thus, the objective of this study was to evaluate the extent to which external eversion moment can be estimated from external eversion moment derived from vertical GRF.

Methods: From three-dimensional foot coordinates and GRF data of 28 healthy participants, we computed external eversion moment (EMrun), center of the ankle coordinates (ANKrun), center of pressure coordinates (COPrun), and vertical GRF (VGRFrun) during the support phase of running. Moreover, we computed center of the ankle joint coordinates (ANKstand) and vertical GRF (VGRFstand) in the resting standing position.

Results: A highly significant correlation was observed between EMrun and external eversion moment derived from vertical GRF ([COPrun - ANKrun] × VGRFrun), with a contribution of 84.7%. Moreover, a highly significant correlation was observed between EMrun and (COPrun - ANKstand) × VGRFstand, with a contribution of 81.5%.

Conclusions: These results indicate that external eversion moment can be estimated from the external eversion moment derived from vertical GRF with high accuracy. Moreover, it was found that the accuracy did not decrease even if the data of center of ankle and vertical GRF were replaced with the data during standing.
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