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Internal vs. External Wedging

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  • Internal vs. External Wedging

    Hello,

    I am working on trying to understand the differences between internal vs.
    external varus/valgus wedging in relation to the change in center of
    pressure. I have read literature that describes what I would consider to
    be internal wedges changing the center of pressure opposite of the wedging
    condition (i.e. lateral/valgus wedge shifting COP medial and vice versa).
    These two studies are: EFFECT OF SHOE MODIFICATIONS ON CENTER OF PRESSURE
    AND IN-SHOE PLANTAR PRESSURES (Xu, et. al. 1999) and A METHOD FOR
    MEASURING FOOT PRESSURES USING A HIGH RESOLUTION, COMPUTERIZED INSOLE
    SENSOR: THE EFFECT OF HEEL WEDGES ON PLANTAR PRESSURE DISTRIBUTION AND
    CENTER OF FORCE (Rose, et. al. 1992). There is a third study that calls
    these interventions external and their wedge internal and have found the
    opposite result (lateral/valgus wedge shifting COP lateral). The title of
    this paper is CHANGES IN PLANTAR FOOT PRESSURE WITH IN-SHOE VARUS OR
    VALGUS WEDGING (Gheluwe and Dananberg, 2004) I am hoping that someone may
    be able to shed light on this topic, and would appreciate any response.

    ---------------------
    Jerrod Braman
    Orthopaedic Biomechanics Laboratories
    Michigan State University
    bramanj1@egr.msu.edu
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