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Leg stiffness asymmetry: clinical implications

Discussion in 'Biomechanics, Sports and Foot orthoses' started by Simon Spooner, Jun 22, 2014.

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  1. Ahh see what you saying.
    If looking from potential energy of both legs/springs it should be +/-0 there are 2 parts of the formula you adjust, spring stiffnes and displacement of CoM.

    So the answer would be displacement of CoM in the question

    0.04618m
     
  2. An asymmetric CoM displacement pathway can offer the same potential energy storeage when the leg stiffnesses are different as a symmetric pathway can when the leg stiffnesses are the same, perhaps. Which makes sense from an evoutionary point of view.

    So why does limping have a higher metabolic cost?
     
  3. musmed

    musmed Active Member

    Dear team

    a couple of things, if the patient has a leg length difference proven by CT ( I presume) it must be present when lying down and standing. The only difference is pelvic shift.

    Dr. Kirby. I read a paper years ago, i think it was in 1996 where the Canadian ballet men's shoes were altered. They changed the depth of one of the shoes without their knowledge. They complained when there was a difference of 1/16th of an inch or greater. So yes the brain knows everything, it's just our ability to read the writing consciously.

    Weird as it sounds I have been plagued all my life when I walk into a room where the floor is not totally level. I feel instantly nauseated.

    Lovely day for winter, 23C here sunny little wind. 2 days ago blew at 130Km and cold!
    Regards
    Paul conneely
    www.musmed.com.au
     
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