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Related threads:
Other Conference Updates: Live Updates from the Australasian Podiatry Conference | Live Updates from i-FAB | Live Updates from the Foot Orthotic Technology Conference

Pre-conference threads:
Biomechanics Summer School 2011, Who's Going?
Biomechanics Summer School 2011
Cheap flights for Biomechanics Summer School
Kevin Kirby Q & A for Manchester Biomechanics Summer School

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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....

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Sincerely,

Kevin

**************************************************
Kevin A. Kirby, DPM
Adjunct Associate Professor
Department of Applied Biomechanics
California School of Podiatric Medicine at Samuel Merritt College

e-mail: kevinakirby@comcast.net

Private Practice:
107 Scripps Drive, Suite 200
Sacramento, CA 95825 USA
My location

Voice: (916) 925-8111 Fax: (916) 925-8136
**************************************************

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

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Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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?

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Craig Payne
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Follow me on Twitter | Run Junkie
God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.

MDCO/ Koutsogiannis increases STJ moments medially?

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?

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

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Craig Payne
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God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.

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.

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Robert Isaacs
Specialist in Biomechanical Therapies
www.Footprintspodiatrysolutions.co.uk

small, yellow, leech-like, and probably the oddest thing in the universe

Semper in excretum sum sed alta variat

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

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

Attached Files

paynesummerschool2forpdf.pdf (35.5 KB, 97 views)

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Craig Payne
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Follow me on Twitter | Run Junkie
God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.

Kevin: 10 Biomechanical functions of the plantar fascia (similar to this discussion)

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Craig Payne
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Follow me on Twitter | Run Junkie
God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.

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.

Attached Images

Spooner's Manchester Seminar Spring Demo.jpg (208.7 KB, 269 views)

__________________
Sincerely,

Kevin

**************************************************
Kevin A. Kirby, DPM
Adjunct Associate Professor
Department of Applied Biomechanics
California School of Podiatric Medicine at Samuel Merritt College

e-mail: kevinakirby@comcast.net

Private Practice:
107 Scripps Drive, Suite 200
Sacramento, CA 95825 USA
My location

Voice: (916) 925-8111 Fax: (916) 925-8136
**************************************************

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

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

Attached Images

Simon, Craig and Kevin at Manchester.jpg (168.4 KB, 262 views)

__________________
Sincerely,

Kevin

**************************************************
Kevin A. Kirby, DPM
Adjunct Associate Professor
Department of Applied Biomechanics
California School of Podiatric Medicine at Samuel Merritt College

e-mail: kevinakirby@comcast.net

Private Practice:
107 Scripps Drive, Suite 200
Sacramento, CA 95825 USA
My location

Voice: (916) 925-8111 Fax: (916) 925-8136
**************************************************

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

World exclusive coming soon - Professor Kirby planking Californian stylee...

I was about to complain about the lack of planking evidence!

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.

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Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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.

Left to right: Kevin, Simon, Trevor and Craig

Attached Images

Kevin, Simon, Trevor and Craig in Front of Signs.Small.jpg (153.3 KB, 258 views)

__________________
Sincerely,

Kevin

**************************************************
Kevin A. Kirby, DPM
Adjunct Associate Professor
Department of Applied Biomechanics
California School of Podiatric Medicine at Samuel Merritt College

e-mail: kevinakirby@comcast.net

Private Practice:
107 Scripps Drive, Suite 200
Sacramento, CA 95825 USA
My location

Voice: (916) 925-8111 Fax: (916) 925-8136
**************************************************

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

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

Attached Images

Kirby plank.jpg (15.3 KB, 232 views)

Very impressive- although extra points would have been awarded for doing it on a hotel bar

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

Thanks for that one Ian. You should have seen me when I had muscles and hair!

__________________
Sincerely,

Kevin

**************************************************
Kevin A. Kirby, DPM
Adjunct Associate Professor
Department of Applied Biomechanics
California School of Podiatric Medicine at Samuel Merritt College

e-mail: kevinakirby@comcast.net

Private Practice:
107 Scripps Drive, Suite 200
Sacramento, CA 95825 USA
My location

Voice: (916) 925-8111 Fax: (916) 925-8136
**************************************************

"Kirby is here and the force is with him"
The Jedi training workshop was my favourite session of the meeting.

__________________
Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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?

__________________
Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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.

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Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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

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I see you girls checkin' out my trunks
I see you girls checkin' out the front of my trunks
I see you girls lookin' at my junk, then checkin' out my rump, then back to my sugarlumps

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.

Cheers,
Neil

Hi Simon, is this available soon?

Just about to begin trials.

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Who? What? When? Why? Yeah? And? So? What?

"My mission drive is to open up my eyes, 'cause the wicked lies and all the sh!te you say..." http://www.youtube.com/watch?v=V4NW5S1UTPQ

"Science is the antidote to the poison of enthusiasm and superstition."

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.