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Live Updates from the Biomechanics Summer School

Discussion in 'Biomechanics, Sports and Foot orthoses' started by admin, Jun 20, 2011.

  1. admin

    admin Administrator Staff Member


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    Last edited by a moderator: Jun 24, 2011
  2. Admin2

    Admin2 Administrator Staff Member

  3. While cooling down from my morning run in the gym, I've just had the opportunity to teach Ian Griffiths proper "planking" technique....we'll see if he has learned anything this morning during the lectures....
     
    Last edited by a moderator: Jun 24, 2011
  4. Re: Biomechanics Summer School 2011, Who's Going?

    Up and running. Prof. Kirby on flatfoot. Blood dripping from
    Cadavers before 9am. Brilliant.
     
  5. Craig Payne

    Craig Payne Moderator

    Articles:
    8
    Re: Biomechanics Summer School 2011, Who's Going?

    It hard to keep up ....
    here is some snippets as we go:

    *PTTD much more common in post menopausal women

    * importance of STJ axis medial deviation in PTTD --- its all about level arms to the joint axis and joint moments. Shorter moment arm --> have to push harder (ie newtons law)

    *increased GRF plantar to the forefoot occurs during late midstance in PTTD, due to the forefoot adduction --> greater lever arm to the more medial STJ axis

    *medial heel skive increases STJ moments

    Anyone here got something to add?
     
  6. bob

    bob Active Member

    Re: Biomechanics Summer School 2011, Who's Going?

    MDCO/ Koutsogiannis increases STJ moments medially?
     
  7. Ian Drakard

    Ian Drakard Active Member

    Trevor mentioned this at the Vasyli conference- not sure if he was just saying we still need to take an overall view rather than only consider the problem area in isolation?
     
  8. Craig Payne

    Craig Payne Moderator

    Articles:
    8
    Simon ... should have been a rock star!

    How do foot orthotics work? .... "they alter forces" !!!

    Simon --- can you explain the spring thing again? .... I sort of get the idea of the spring stuff, but probably not well enough to link it to the argument for dual density posting
     
  9. Damn I wish I was there.

    Craig, is there any chance you could crack the tissue stress bit off as its own thread? This could be the thread of the year if Trevor is willing to stick around.

    Initially, I tend to think that both the tissue stress and the normal abnormal concepts must be tempered with a certain amount of "it depends". To take Trevor's example of immobilising something, there is a time when this is meet and proper even if it IS abnormal.
     
  10. Lab Guy

    Lab Guy Well-Known Member

    quote:
    Originally Posted by Craig Payne
    It hard to keep up ....
    here is some snippets as we go:

    *PTTD much more common in post menopausal women

    * importance of STJ axis medial deviation in PTTD --- its all about level arms to the joint axis and joint moments. Shorter moment arm --> have to push harder (ie newtons law)

    *increased GRF plantar to the forefoot occurs during late midstance in PTTD, due to the forefoot adduction --> greater lever arm to the more medial STJ axis


    Is it forefoot adduction or forefoot abduction? Maybe Craig just made a typo error or my thinking is wrong.

    I would think that weakness of the PTT will cause the STJ axis to deviate medially with pronation of the MTJ and abduction of the forefoot on the rearfoot.
    We will see abduction of the forefoot in late midstance as the MTJ is unable to resupinate due to the decreased supination moment from the weakened PTT.
    Since GRF is not being transferrred from lateral to medial, the ball of the foot is spending more time absorbing the impact before the apropulsive lift off.

    Wish I was able to attend.

    Steven
     
  11. Craig Payne

    Craig Payne Moderator

    Articles:
    8
    Here is the second part of my lecture on clinical tests/pathology specific prescribing lecture that was not in the handout.
     

    Attached Files:

  12. Craig Payne

    Craig Payne Moderator

    Articles:
    8
  13. Here is Dr. Spooner's spring demonstration from the first day of Biomechanics Summer School (Simon is far right with microphone in hand).

    "Short Spring" Griffiths is second from left.:drinks
     

    Attached Files:

  14. The "Tissue Stress Trio" from Biomechanics Summer School.....early on day one of seminar.

    Left to right....Craig, Kevin,Simon
     

    Attached Files:

  15. Griff

    Griff Moderator

    Size doesn't matter, as long as it's stiff enough ;)

    World exclusive coming soon - Professor Kirby planking Californian stylee...
     
  16. Ian Drakard

    Ian Drakard Active Member

    I was about to complain about the lack of planking evidence!
     
  17. Thanks to all who attended, the organisers and my fellow presenters. It was a great
    Meeting and I am stoked that UK podiatric biomechanics is so healthy and forward thinking. When prof. Kirbys work is considered as the traditional approach it shows we haven't been stagnating here in blighty. Rather, we are evolving our thought processes and our clinical reasoning; moving forward

    Thanks all.
     
  18. Here's the lecture crew at the completion of a very successful 2011 Biomechanics Summer School from Manchester, UK.

    Thanks again to everyone involved in making this a great two days of learning for all of us.:drinks

    Left to right: Kevin, Simon, Trevor and Craig
     

    Attached Files:

  19. Griff

    Griff Moderator

    As promised, here is the Podiatry Arena MVP turning back the years:

    (Video of this feat of strength to follow...)
     

    Attached Files:

  20. Ian Drakard

    Ian Drakard Active Member

    Very impressive- although extra points would have been awarded for doing it on a hotel bar ;)
     
  21. victor

    victor Member

    BIOMCHANICS SUMMERSCHOOL

    Just wanted to say a huge thank you to Dr Kevin Kirby, Mr Trevor Pryor, Mr Craig Payne and Dr Simon Spooner for a very educational and thought provoking 2 days. I have not slept properly for 3 days as I cant switch my brain off! Without a doubt the most stimultaing 2 days I have had as a podiatrist, and I am very confident ny practice will improve because of it. This is why I joined the porfession!!
    Vic
     
  22. Thanks for that one Ian. You should have seen me when I had muscles and hair!:drinks
     

  23. "Kirby is here and the force is with him"
    The Jedi training workshop was my favourite session of the meeting.
     
  24. I guess the two guys in the background of the photo in which Kevin "out-planks all-comers" are podiatrists who are also members of the "think-tank"- right Robeer?
     
  25. A thicker section of homogenous material loaded within its linear range should tend to deform more per unit load (linearly) than a thinner section of the same material. If we take the simple example of a wedge of EVA then the thick end of the wedge will deform more per unit load than the thin end if it acts in a Hookian fashion (hence the springs). During uniform loading upon this wedged section, the rate of transfer of momentum should be higher at the thin end of the wedge compared to the thick end of the wedge (lamp-post versus padded lamp-post- thin crash mat versus thick crash mat). The centre of pressure should therefore tend to shift toward the thin end of the wedge in this situation (or not move at all if we model with angular deformation- that's another story) compared to a flat piece of the same material.

    If we use a dual density wedge (or even a dual density material with a horizontal surface, with the higher Young's modulus material at the thick end or one side, it should tend to increase the rate of transfer of momentum in the areas of higher Young's modulus, thus "pulling" the centre of pressure toward the area of stiffer material. So, if you wanted to shift the centre of pressure medially under a heel, you could use a flat insole with a higher density material on the medial side. This may actually change COP position greater than using a varus wedged homogenous material beneath the heel, since the load/ deformation characteristics of the homogenous wedge are trying to pull the centre of pressure laterally.

    The other design factors (i.e. geometry at the foot-orthosis interface and/ or frictional characteristics at the foot-orthosis interface) may pull the centre of pressure medially but the load/ deformation characteristics will be fighting against these two other factors in this wedge example.

    In total, the three design factors which we can control within a foot orthosis: load /deformation at the foot-orthosis interface, geometry at the foot-orthosis interface and/ or frictional characteristics at the foot-orthosis are all we have to work with since at the moment foot orthosis are inert pieces of bent plastic. So, if the design aim was to move the centre of pressure medially under the heel, why would you design the orthosis knowing that one of your 3 controllable design variables is likely to do the opposite? The question is- does the geometry out-weigh the load/deformation? My contention is that we should use all of the design features available to us and have them working in concert, not potentially fighting against one another. Hence the dual density I was talking about in my lecture. You can do something similar manipulating shell thickness/ post design too- hence the FEA of the internal oblique post versus in the standard post. I think more exciting than dual density and post designs (posts are a Rootian legacy) is the "spike" orthotic which would enable us to pull the centre of pressure exactly where we want it at the foot orthosis-interface.- There is always more than one way to skin a cat, we don't need spikes in the superior surface sticking into the foot, they or a track-line arrangement increasing the load/deformation characteristics of the orthosis along this line compared to the surrounding foot interface area can be on the inferior surface of the orthosis.

    Hope that makes sense.

    I'm currently working with Langer on something which will hopefully supersede the concept of posting angles.
     
  26. RobinP

    RobinP Well-Known Member

    A personal note of thanks to Craig, Kevin, Simon and Trevor for some great lectures and workshops over the weekend. Thanks also to the Langer group for putting on a great event.

    Great to meet everyone at last. Hope it is the first of many times.

    Regards,

    Robin
     
  27. N.Smith

    N.Smith Active Member

    My brain officially hurts now! What an honour it was to finally meet the "masters" and look at their different views merge into one (I think?). I knew Craig was one, but to finally get the chance to meet with Kevin, Trevor and Simon was somthing I'll not forget, along with all of the people that you know the name but never met. I was also lucky enough to bump into (or lets say, rudly interupt) Kevin and his lovely wife Pam, at breakfast and have a private conversation about orthotics and the industry. As busy as his schedule was, he kindly asked me to sit with him and Pam and join them. Feeling unworthy I stood there sort of wating for a sign or gesture of - OK, it was nice to meet you but we're sort of busy right now" but couldn't have been more shocked, as the conversation seemed to flow naturally. Very cool indeed! To also have a few cold ones with Trevor and Simon and talk about feet and orthotics was another surreal moment. If there's anyone out there that has the opportunity to talk with any of these guys, and don't, cause you might feel a bit intimidated...just do it! You'll be pleasently surprised, I promise. :drinks

    Cheers,
    Neil
     
  28. Arthur.Clarke

    Arthur.Clarke Active Member

    Hi Simon, is this available soon?
     
  29. Just about to begin trials.
     
  30. James Welch

    James Welch Active Member

    Thank you Kevin for your photo making all five of us look equally "special" - A-hole, Griff, "lee!", who are you and Finchy.

    All I can say, what a fantastic conference. May I extend my warmest thanks to Kevin, Trevor, Craig and Simon for all of their hard work in the world of biomechaincs podiatry and long may it continue. A superb conference had by all and my head is going to hurt for a long time to come.

    Simon, I will be stalking you - just thought I'd give you a head start.

    :drinks
     
  31. Arthur.Clarke

    Arthur.Clarke Active Member

    Is it a off the shelf insole or a casted device?

    Sorry for being nosy! I couldnt help!
     
  32. Both.
     
  33. Thanks, Lee.
     
  34. alessandro costa

    alessandro costa Active Member

    Hi to everyone, I'm new here. I was in manchester on 24th and 25th, really interesting conference.
    What do all think about using MBT in patient with HALLUX RIGIDUS and HALLUX LIMITUS (and functional orthosis of course ) ?
    Thanks, Alessandro from Italy
     
  35. Alessandro, follow this link http://www.podiatry-arena.com/podiatry-forum/tags/index.php?tag=/mbts/ and read the threads in which we have discussed this.
     
  36. DaveJames

    DaveJames Active Member

    Big thanks to Dr Kevin Kirby, Dr Simon Spooner, Mr Craig Payne and Mr Trevor Prior for a fantastic summer school. Guys, my knowledge has increased massively, and there's so much cool stuff for me to consider and work with. Thank you. :drinks

    I've met plenty of new people, caught up with some old acquaintances, drunk the odd boddington and witnessed Dr Kirby out-planking Ian Griffiths. Now that will be the stuff of legend for generations to come!

    Dave
     
  37. That's right. The longer it is, the less stiff it is. Glad you were paying attention, Griff.;)
     
  38. Good to meet you, Dave. Thank you for the ammunition with which to rib Kirby for a couple of days. :drinks He is rather "traditional" these days. Funny how even after the mans death, indirectly, Mert Root can still turn Kevin into the "angry podiatrist". "How do you treat a forefoot valgus?"- yeah, that'll get the blood pressure elevated. Cool.
     
  39. Griff

    Griff Moderator

    Just decided on my 2 favourite photos from the weekend...

    In second place, the man himself demonstrating STJ axis location examination. Witnessing this is like having Bill Gates teach you how to use Microsoft Office.
     

    Attached Files:

  40. Ian Linane

    Ian Linane Well-Known Member

    Thanks to Langer, Kevin, Simon, Craig and Trevor for an excellent two days. Certainly good to meet the faces behind the names on Arena. Much to absorb and digest.
     
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