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Why is LOG disregarded when assessing direction of external moments during gait?

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  • Why is LOG disregarded when assessing direction of external moments during gait?

    From a kinesiological perspective, when discussing static upright posture and the direction of gravitational moments at the hip/knee/ankle, since the LOG and GRFV are coincident, a determination of the direction of the gravitational moment can be made simply on the basis of the location of the LOG in relation to each joint center. Thus, in most kinesiology texts, this is depicted using a plumb line. However, during dynamic postures like gait, where the LOG and GRFV are often not coincident, those same kinesiology texts only consider the GRFV when assessing the direction of gravitational moments at the hip/knee/ankle and fail to mention the effect of the LOG in the discussion or even draw the LOG in joint moment gait-related diagrams. In light of the two force vectors often not being coincident during gait, can someone please share with me why the location of the LOG is disregarded in gait-related discussions of the direction of gravitational moments and instead is solely based upon the location of the GRFV?
    Thank you,
    Dennis Torre
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