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  • Open Access

Difference in force direction during propulsion between subjects with different push-off locations

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Journal of Foot and Ankle Research20103 (Suppl 1) :P8

  • Published:


  • Public Health
  • Opposite Direction
  • Individual Difference
  • Distinct Difference
  • Lateral Force
It could be hypothesized that when walking in a linear direction, the most efficient strategy would be to focus the force created by the push-off in the absolute opposite direction to the direction of propulsion. Forces in a medial or lateral direction could then be considered as loss of efficiency since these forces do not create movement in the intended direction. The aim of this study was to investigate if individual differences in push-off location of the forefoot resulted in difference in force direction. Three subjects with different push-off locations were identified through video gait analysis. The subjects were categorized as having either a lateral (subject 1), central (subject 2) or medial (subject 3) push of location. The subjects walked over a force plate (Kistler) where medial and lateral forces were registered. The results showed distinct differences in force direction between the subjects during the propulsive period of gait (70%-100%) (see figure 1).

Figure 1

Difference in force direction may lead to differences in propulsive efficiency. It could also be hypothesized that proximal segments need to compensate in order to keep a subject with medial or lateral force deviations walking in a linear direction of propulsion.

Authors’ Affiliations

Karolinska Institute, Stockholm, Sweden


© Englund and Arndt; licensee BioMed Central Ltd. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.