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Kindly help - plantar pressure distribution

Discussion in 'Biomechanics, Sports and Foot orthoses' started by anv273, Jul 13, 2014.

  1. anv273

    anv273 Member

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    I am a masters student currently working on a project which involves foot pressure mapping.

    Could somebody please tell me the percentage distribution of weight on different regions of the sole of the foot?

    The regions are
    Heel , 1,2,3,4,5 Metatarsal heads and Hallux
  2. N.Knight

    N.Knight Active Member

    Re: Kindly help

    Surely this will be different in everyone, so many variables , stiffness , weight, pathology, plantar flexed 1st ray etc.

    Then what is the best distribution?

    What is your research question?
  3. anv273

    anv273 Member

    Re: Kindly help

    Yes. It depends on a lot of factors. I will explain my requirement.

    I am interested in static analysis of foot pressure distribution. i.e in a barefoot standing position.

    Consider the case of a person with an average body weight. Say 70 kilograms (154.3 pounds)

    How will be the body weight distribution on his foot? i.e What percentage of the total weight will be acting on his heel region?

    Same in the case of other regions
  4. anv273

    anv273 Member

    Re: Kindly help

    And this is in the case of a healthy person.
  5. Griff

    Griff Moderator

  6. efuller

    efuller MVP

    Re: Kindly help

    I've looked at a lot of standing pressure maps. They are not all the same. What are you going to use the pressure distribution for. Is an average of several appropriate?

  7. anv273

    anv273 Member

    I want to record the peak pressure recorded at the various points on the sole.

    (Great toe, Metatarsal heads and Heel)

    I want to analyse the variation of pressure distribution in standing for normal and diabetic subjects.
  8. efuller

    efuller MVP

    Have you reviewed the literature. I think this has been done.

    One problem with looking at peak pressures is that different measurement systems can give you different values. One reason for this is different sensor sizes.

    Another issue you might have is identifying specific anatomic landmarks. One pressure measurement system has the ability to automatically calculate pressures in areas determined by percentages of length and width of the foot print. Feet with increased first and second intermetatarsal angle will be wider with a bigger gap between the first and second metatarsal heads. So, one percentage of width may not accurately delineate the area that you are interested in across all feet. Actually, that may make an interesting study. How, much error would be created if you used the same percentage for all feet as opposed to creating a percentage for each foot.

    Good luck
  9. anv273

    anv273 Member

    Sir, Theoretically how are the different pressure areas determined w.r.t percentage of length and width of foot? Could you please explain it mathematically?
  10. efuller

    efuller MVP

    I'm not sure I understand you question. Are you asking how the pressure within an area is determined or how the areas are determined?

    If it's how the areas are determined.....
    You, the operator of the system, use the provided software and arbitrarily select a percentage of foot length as what you think the length of a particular body part should be. You could look at several x-rays of feet and look at total length of the foot and then arbitrarily decide on an anatomical landmark that delineates the beginning and end of an area that you want to study and then figure where that is relative to total length to give you a percentage. You could do this for several feet to create an average. Or you could do it for each foot.


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