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Joint moment asymmetry

Discussion in 'Biomechanics, Sports and Foot orthoses' started by NewsBot, Jul 8, 2014.

  1. NewsBot

    NewsBot The Admin that posts the news.


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    Evidence for joint moment asymmetry in healthy populations during gait
    Rebecca L. Lambach, Jessica L. Asay, Steve T. Jamison, Xueliang Pan, Laura C. Schmitt, Katerina Blazek, Robert A. Siston, Thomas P. Andriacchi, Ajit M.W. Chaudhari
    Gait & Posture; Articles in Press
  2. davidh

    davidh Podiatry Arena Veteran

    •Asymmetry may have implications on the interpretation of gait evaluation.

    Well..... yes:rolleyes:. That has been kind of obvious to anyone working with gait who cared to look.
  3. I haven't read the full paper but I think what they are saying is that a degree of asymmetry is not "abnormal".
  4. davidh

    davidh Podiatry Arena Veteran

    Me either - but isn't a degree of asymmetry being normal kind of obvious?
  5. Well one would think so. However, I spoke recently with Trevor Prior who is promoting a variant of the Vicon system and it was clear to me from my discussion with him, that asymmetry is something he looks to correct. Indeed, many clinicians I can think of actively seek to "make the patient more symmetrical"... some even believe that that there is an idealised alignment that all patients should be measured against and corrected toward...

    Which begs the question, is symmetrical "better" than asymmetrical on a symmetrical surface?

    Until very recently, I felt that symmetry in the centre of mass (CoM) displacement pathway should be a desirable goal in this kind of environment, these days I'm not too sure.
  6. davidh

    davidh Podiatry Arena Veteran

    I believe not, if only because we DO support and ambulate on other surfaces sometimes.
    A compelling argument for not introducing symmetry to an living asymmetrical biological stucture is that other, balancing structures, such as the spine and hip and back musculature may also be asymmetrical.
    Horses for courses though. Each patient/case is different.
  7. Leopold

    Leopold Member

    Symmetry is abnormal. Our organs are the easiest example of "proper" asymmetry. Another good example that I found in a physio book by Diane Lee showed SI joint inclination differences from left to right on cadaver dissections. Our brains are asymmetrical, our handedness is asymmetrical, the list goes on...
    I believe the left and the right should be addressed individually.
  8. davidh

    davidh Podiatry Arena Veteran

    I don't want to appear contentious, but you make four different points in three sentences without elaborating on any of them - which is a bit confusing. Would you care to explain each point further?
    You may want to incude the effects of preservative, one of which is soft tissue shrinkage, in your explanation of cadaver evidence..............

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