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Mahalo Eric,

Your quote,
Ankle plantar flexion is not just the forefoot going down. It is also the rearfoot and leg moving upward with the ball of the foot staying on the ground. When the force from the talus acting on the bottom of the tibia is greater than the force of gravity acting on the rest of the body, the body will accelerate upward and motion is initiatied by the muscles creating tension in the Achilles tendon.

Eric
What if we use an external simple machine say the spring orthotic device to lever the rearfoot off the ground what is causing the lift?
Is it the energy stored in the composite plate or the cantilever of the rigid craddle over a plantar pivot? Most people do not under stand the device i believe you and Craig have a good shot though.

Mahalo,
Steve

Kingetics- Enlightening Your Load...TM

Hi Steve,

If you have an external machine pushing upward on the heel then you would have two forces that would be creating an upward force on the heel. The plantar flexion moment combined with the ground reaction force on the forefoot will tend to lift the heel up in the air. If the ankle plantar flexors worked faster than the machine pushed then the spring would not contribute to the lift. If the machine was faster than the ankle plantar flexion then it would help the lift and less effort on the ankle plantar flexors would be required. (However, it would take some learning in relatively coordinated individual to make the machine create the optimum motion. In normal every day activities we will need different velocities of ankle plantar flexion. It will be very hard for a machine to help produce those varied velocities. Or, put another way, the output of the machine has to vary with the task. There will be some times during the day that you will want to lower the heel when the machine is trying to raise it. So, there will be times when machine will be working against you. For most people, the normal use of the ankle plantar flexors will produce the motion that they need, because the muscles are directly wired to the brain. The machine isn't. So, the question arises, why would we want this device?

Eric

Aloha Eric,

1. Bent compressed carbon fiber under tension will return to its non-flexed state faster than any biological system. That is one reason why the AFO's and composite leg prostheses work so well.
2. A biased catilever "simple machine" will lift the heel at a faster rate than ankle plantarflexion if the ratio is not 1:1.
3. The Spring Orthotic Device patent awaits your review, please web search it and read it starting from page 35, figure 14 is very helpfull.
4. There are 85,000 diabetic amputations in the US per year. I believe this system will help off load high pressure areas and reduce shear by mechanical means. Which MAY reduce this very bad number.
5. IED's cause are causing most of our war casualties, yet the boot makers are still making foam and rubber boots and our troups are wearing blast resistant underwear to limit blast debrie from entering their abdomin and testicles. The most under of our underwear are the boots we wear under our feet.
5. You have never seen this before take your time, if you have questions please ask them, you will be at the head of the class.

Mahalo,
Steve
Kingetics- Dusting Disabilities...TM

__________________
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."

Aloha,

Jeff Root refered us to this website. He said that there may be some good folks who could understand and assist our vetting of this new technology.
It is important due to the fact that our grant SBIR A11-109 (Advanced Composite Insoles for the Reduction of Stress Fractures.) is being sponcered by the US Department of Defense and the US Army's Medical Research and Materials Command. Peter Cavanaugh's company DiaPedia was the other grantee.

I belive that point #2 A biased catilever "simple machine" will lift the heel at a faster rate than ankle plantarflexion if the ratio is not 1:1. Is not correct. The rate of heel lift if you take into account excursion will be slower at the heel but the ability to lift a bigger load is enhanced. Again here is why i hope you and Craig and others may help us present this correctly. It confuses many people just ask Simon what he thinks he thinks.

Mahalo,
Steve

Kingetics- When you come to a fork in the road, Jump Over It...TM

I'm not confused in the slightest. I am however, completely unconvinced by you and your apparent knowledge base.

I think the word you are looking for is "cantilever", by the way. Go look it up.

Still awaiting a photograph of one of your devices and for you to answer the questions put to you the last time your tried to push your product here, Steven.

Here's a question: what are the limitations of carbon fibre when used as an orthotic material?
Here's another: how important is it that energy stored in an insole is returned at the correct time and spatial location during gait?
Another:
How does the surface geometry of a piece of carbon fibre influence its load/ deformation characteristics?

Go back to original thread, I'm sure there were more questions asked of you there which you failed miserably to answer.

In the meantime, it's my birthday and I'd rather go and stick my gouty 1st MTPJ in a bacon slicer than spend my time reading any more of your made-up drivel.

Kingetics- When someone asks you a question that you can't answer, ignore it and hope it goes away...TM
Kingetics- making it up as he goes along, again...TM
Kingetics- "Like a preacher stealing hearts at a travelling show. For the love of...." http://www.youtube.com/watch?v=UpxI3...eature=related ... TM

__________________
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."

Have a good one
Tim

Simon:

You are getting to be quite the mature and distinguished man now that you are well into your fifth decade of life. Don't despair, my experience has shown that the mid-50's are still something to look forward to....Happy Birthday.

__________________
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
**************************************************

Cool your boots, I'm only 42

Thanks my friends.

__________________
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."

And by the way, the bacon slicer says that she is happy for me to do that- boom boom, "A bit of blue. He's blue Derek, he's blue..." in the style of Peter Kay, obviously

__________________
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."

Just a spring chicken.....

Attached Images

Spooner.jpg (4.4 KB, 74 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
**************************************************

Yeah, nice... 34 in that picture. Fat and unfit. Since then I've been through the lean and mean period during my rugby renaissance and now back to fat and unfit again following my rugby injury. Never mind. More hair now too.

And for those of you who have never had the pleasure of a full blown episode of the salmon and trout, I sh!t you not, it's the most painful thing I've ever, ever experienced. And I've had a few kicking's and a selection of broken bones, ligament ruptures, appendicitis etc in my time (I know I've never given birth ladies, but that's nobody's fault, not even the Romans). The classic "it's like a hot corkscrew being inserted into the joint" is an understatement. I'd go more that the joint has turned to molten lava and someone has taken a Black and Decker to it in attempt to extract the molten goo. And no, I can't stand the weight of the bed clothes on my foot right now. And yes, I am cranky.

The first time I had "the gout" it was a mild attack, this time it's total conflict. Not funny. Bored of it now...
AAAAAAAAAAAAAAAAGH.

__________________
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."

Dear Dr King

Your spring orthotic device looks intriguing but there appears to be a flaw in the design.

Basically from what I can gather by looking at the patent drawings, the device is like a spring assisted see saw. The idea is that the spring assists the see saw to recover its original position after loading the spring. However it appears that what you would gain from the increased moments that rotate the body forward would be negated by the increased moments rotating the body backwards. So you would have greater propulsion but conversely you would have increased braking so overall forward velocity might be constant. Wouldn't this seem to make sense since if you could add some extra propulsive energy into each step then wouldn't you tend to progress at ever increasing velocity until you reached the seed of light?

Regards Dave

__________________
Descartes seems to consider here that beliefs formed by pure reasoning are less doubtful than those formed through perception.

I looked at the patent. It appears that you have a carbon plate with essentially a rocker point that appears to be approximately 30% of the foot length from the back of the heel. From the drawings I'm not sure what the design is anterior to that point. Is the front end of the plate fixed? What is it fixed to? Does it move?

These are important questions for determining if the device would work.

I'm not sure about your ratio statement. The ratio between what and what?

Eric

Mahalo,
Dave and Eric and Arena,

I will concede that the patent was written by a lawyer and is for lawyers. The diagrams believe it or not were drawn by a professional patent draftsman. Since the whole device is an “orthotic” our mechanical and composite engineer and co-inventor Paul Hewitt of Rocket Composites Inc. in Sacramento California helped pen some new terms for the different parts, ie. cradle, spring plate, and pivots. I coined the term Impact Disease since I thought under-mitigated impact may cause more pathology than overuse.

Dave i have not reached the speed of light yet but i am working on it. You have to do a lot of traveling to try to disprove that you have created the fastest-lightest-safest shoes on the planets...

The concept is simple and it works well. In the rear foot two counter positioned pivots bend a carbon fiber plate. The components can be "bonded" but not at both contact points, it causes a "warple = warped ripple" in the spring. The contacts points on my 6 mile run this morning along the Kealia Wildlife Refuge were unbonded but mechanically attached. I cover the springs with Kevlar to reduce abrasion to the underlying bidirectional and unilateral carbon fiber layers.

The system in my best judgment consists of 4 simple machines in a kinetic chain.
Incline plane-Cantilever-Decline plane-Long Lever
Each simple machine enhances energy efficiency and work.
At heel strike the pivot on the cradle flexes the rearward section of the spring into a double bend, this allows for more energy storage than a single flexion (like a coiled spring), this is a incline plane simple machine. It slows down downward velocity and harnesses this energy for later use. It also enhances stability.
As the ankle/foot plantar flexes the rigid cradle (it must be rigid or you would feel the pivots underneath) cantilevers over the spring pivot, the natural movement of this will lift the heel. This is the cantilever simple machine. This looks really cool on FScan as you see the COM stall a little at heel strike then zoom to the forefoot. The time vs. force graph is flat topped with minimal impact spike.
The third simple machine i have never heard described before--Decline Plane yet it is the one simple machine we use in our existing footwear (Why do cowgirls have high heel boots?) the 22-12 rule. This allows the COM to increase velocity over a shorter distance.
The last simple machine is created by the shoe or boot "housing" assisting as a long lever to bend the forefoot spring section. When we attach the system above the ankle we can bend the forefoot spring with greater ease. This worked well when i attached the system to a pair of Ossure Carbon Fiber AFO's and speed walked the Maui Marathon three years ago. This is also important for reducing the forefoot pressure and shear,,,ie healing and keeping ulcers healed, all the bioengineered skin grafts are just punching wind if we cannot reduce shear. It is also a lot of fun on the bottom of a pair of crutches!
Each component can be changed to better control and guide gait. The spring can be made with custom modulus of elasticity by changing the fiber orientation and thickness (doubling spring thickness height cubes the strength). The pivots can have different radiuses of curvature and height. The location of the pivots can be constructed to alter the flexion moment of the spring. The cradle can be contoured to match the foot surface or posted to create a desired correction. I apply a top cover of 3mm cloth covered neoprene on top of 3mm poron, that’s all the foam in the system.
It is a lot of fun. I have been able to recover from a nasty Jone’s fracture and complete 3 Maui Marathons, 3 Xterra Championships, and a play whole bunch of Ultimate Frisbee and Tennis.
Congrats Simon on your 42 trip around the Sun. I empathize with your sore painful toe. I have never had gout but I have had some Royal Pains before and some recently. My best advice is to back away from the Kawa bowl,,,BULA!
Thank you gentlemen and ladies for considering some new thoughts.
I am sorry they are not currently for sale, you will need to make your own research pair.
A Hui Hou,
Steve
Kingetics- Greatering Play Time…TM

simon

is your gout better today?

__________________
Descartes seems to consider here that beliefs formed by pure reasoning are less doubtful than those formed through perception.

Simon, all the best, something we do have in common.............apart from stunning looks of course.........................wait till it gets into ya' knees lad and you need to "pay a penny"!

__________________
LIBERAL small 'l' AND PROUD"

Here is the paper from Kleindienst on knee joint loading differences between forefoot and rearfoot strikers.

Attached Files

Differences in Knee Joint Loading Between Forefoot and Rearfoot Strike Running Patterns.pdf (1.05 MB, 9 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
**************************************************

Here is the reference for the paper by Kleindienst et al that showed that forefoot striking running showed increased knee abduction moment, increased knee external rotation moment at the end of midstance phase, increased knee internal rotation moment during landing, higher braking and acceleration forces, and increased eversion velocity and rearfoot excursion when compared to rearfoot striking running. I have also included a better quality pdf of the paper than what I provided yesterday.

Kleindienst FI, Campe S, Graf ES, Witte K: Differences in knee joint loading between forefoot and rearfoot strike patterns. In Frederick EC, Yang SW (Eds). Proceedings 8th Footwear Biomechanics Symposium, pp. 129-130, 2007.

Attached Files

Differences in Knee Joint Loading Between Forefoot and Rearfoot Strike Running Patterns.pdf (152.9 KB, 9 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
**************************************************

Aloha,

Kevin keep ignoring this, perhaps it will go away. I came to you in good faith two years ago with this and you would not help because we could not pay you. WE still cannot pay and for that i am sorry. Dr. Cavanaugh said he did not have the "Bandwigth" to help then he applies for the same grant we wrote? Dr. Harkless has seen the device and stated he did not understand the biomechanics and maybe he would send it to Dr. Christiansen, if he remembered. Dr. Beth Jarret will not respond as well. We must be on the right track then if the guru's of our profession are unable to follow our new trail.

When prior students of biomechanics come forward with new idea's to solve some of the problems we face everyday what do we do? What should we do?

Mahalo,
Steve

Critically evaluate them. I posed some questions to you Steven, you failed to answer them...

1) What are the limitations of carbon fibre when used as an orthotic material?
2) How important is it that energy stored in an insole is returned at the correct time and spatial location during gait?
3) How does the surface geometry of a piece of carbon fibre influence its load/ deformation characteristics?

Tell you what, I'm lecturing over in Belgium later this month on the evolution of orthotic therapy, attach some photographs of your orthotics, the ones you went for a run in the other day, and I'll include it in my lecture.

In fact, leave the questions for now, lets start by you posting up the photographs of the devices which show the design features in your patent which you claim you went running in the other day...

__________________
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."

Steven:

There is a big difference between a private practice podiatrist who has a patent on some new device, contacts me privately, and then wants me to spend my valuable time helping him evaluate his product, but can't offer me any compensation for the time that would be required to perform these services for him............ and a podiatry student who has a question on a new idea of theirs.

I would have thought that our discussions on your product were private. But now, since you have now revealed the content of our discussions publicly, don't expect me to reply to you privately or help you in any way with your product from here on.

In fact, I'm now sorry I ever responded to you in the first place. I can see now that the time I spent reviewing your product was a complete waste of my time. I'll be sure to let others to know what has transpired here so they can form their own decisions. Perhaps the "gurus" know a trail leading to nowhere better than you do?

__________________
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
**************************************************

Steve,

When I was looking at you original post, I was thinking that you needed a consultant that understood center of pressure and how muscles alter center of pressure. I see now that you have not been able to figure this out for yourself and you are looking for free help. So, you are thinking about bringing a product to market. Do you have any investors yet. Why should the folks here on the arena help you earn some money, if you are not willing to share some of it.

My suggestion is to read the Hicks paper on muscle function. That will be very helpful in your figuring it out for yourself.

Although, I am very curious as to how the device works. Do you have a video of sagittal view of a step with the device?

Eric

Aloha Simon,
I apologize for not answering your previous questions I thought they were mostly rhetorical and mean spirited. I have compiled a list of all of your questions and will try to answer them now. Could you please answer mine as well, quid quo pro?

Here's a question: what are the limitations of carbon fibre when used as an orthotic material? Ans- vague question, we try not to keep it directly against the skin unless it has a top coating of some nature, cabon fiber can wear out and break a majority of its fibers causing spring failure.

Here's another: how important is it that energy stored in an insole is returned at the correct time and spatial location during gait? Ans- very important. Those of us who have read Dr. Nigg’s new book know that now.

How does the surface geometry of a piece of carbon fibre influence its load/ deformation characteristics? Ans- It affects the contact surface of the foot and the weight distribution of the load.
Why? To paraphrase my own mentor recently- fastest over which distance? And why? Ans- Over all distances because the physics of energy conservation.

What is it that you are a Dr of? Marketing? Ans- Doctor of Podiatric Medicine and Surgery from the William M. Scholl College of Podiatric Medine 1996. Pedorthist from Northwestern University Medical School 1996. I have never taken a marketing class.

Again, this statement does not put right the erroneous statement that you made previously that composites store more energy than foams. Can you support your previous contention? Is "foam is foam" your best response? Ans- As stated in the Spring Orthotic Device Patent on pages 6-7 table one the modulas of elasticity vs. density shows that carbon fiber has a modulas of elasticity of 221 GPa and blown foam/rubber is 0.03 GPa.

Why should the hardest surfaces be the fastest? Ans- Darren up at U. of Calgary has hypothecated it.

Why should the hardest surfaces be the fastest? Ans- No Foam to absorb energy.
Hint: what happens to the leg stiffness (kleg) as surface stiffness (Ksurf) changes? Ans- It stiffens as contact stiffens using more energy to midigate the shock through muscle tuning.

Are you just guessing or are you approaching this subject from an educated point of view? Ans- Not guessing but I have asked you my learned and educated colleagues to assist with the vetting since we do not have all the answers or questions yet.

What is it that you are are trying to sell? Ans- Nothing is for sale, yet.

What was it you were selling again? Ans- Nothing is for sale, yet.

What is it that makes your's different, other than the poxy tag lines? Ans- The Novel use of Simple machines to enhance gait. Rise Above Stay Kingetic…TM

Have you actually manufactured one of these devices yet, Steven? Ans- Yes. They are not for sale, yet.

Where is the clinical evidence to support any of your claims Dr. King? Ans- A 10 man study was completed for the patent. A one man study was also done by Northwest Biomechanical Labs. A DoD SBIR A11-109 study is currently underway.

Where can I buy one of these wonders? Ans- They are not for sale, yet.

Orthotics [sic] that are fast... whatever next? Ans- Yes fast and efficient. These may be your next shoes or rubber slippers may be whatever you choose.

Do they work? Ans- Yes good enough to run 3 Maui Marathons, 3 XTerra championships and play USTA league tennis and UPA sanctioned Ultimate Frisbee.

I don't know I haven't caught it yet. Now, I'm guessing I could easily make an orthotic device which is lighter than that envisaged in the patent and how are we measuring safe, by the way? "That orthotic is safe, dude. I just scored an 1/8 off it." Ans- Spring Orthotic Device patent page 12 figure 3. It is a summation of fast-light-safe. You can wear a pair of Crocs or Nike Frees that are lighter but are they safer and faster? Testing standards for safety are found in ASTM 2412-05 testing protocols.

You're a doctor? Ans- Yes my diploma from SCPM and state of Hawaii license says so.

Seriously, you're a doctor? Ans- Yes seriously I am a doctor and a pedorthist.

Of what? Tm Ans- I am a doctor of Podiatric Medicine and Surgery.

Can you evidence any of that? Ans-Yes my diploma and license are evidence.

Rhetoric question. Of course you can't. You are full of sh!t. And you are a doctor of what exactly? Ans- A doctor of Podiatric Medicine and Surgery.

Need we continue with these trade marked tag lines? Ans- Yes they are fun to create.

Kingetics- you are fooking joking... right Dude? Tm Ans- No joke but completing lot fun runs and hikes.

How many soldiers have you made safer, Steven? Ans- None yet apart from myself a prior US Army officer in the Medical Service Corps who treated many soldiers with unsafe conditions.
Your insoles have not even been tested by the military have they, Steven? Ans- Phase 1 SBIR A11-109 is currently being completed for the US department of Defense and the Army’s Medial Research and Materials Command.

Offensive, you are. Your insoles only exist on a piece of paper, don't they Steven? Ans- They have both offensive and defensive capabilities. They exist in our testing labs and on my feet today while I type answers to all your important questions.

For anyone following- go back and count the number of questions Steven has been asked. Now count the number he has answered. The first is very simple- what are you a doctor of Steven? Ans- Too many to count Simon. I am a doctor of Podiatric Medicine and Surgery.

How many soldiers you made safer? Ans- None Yet other than myself.
How do you know you orthotic is the fastest? Ans- Physics!

Where is that photograph of one of your orthoses? Ans- No photo’s please make your own pair.

So, the question arises, why would we want this device? Ans- To make the less ambled The More Ambled.

Wouldn't this seem to make sense since if you could add some extra propulsive energy into each step then wouldn't you tend to progress at ever increasing velocity until you reached the seed of light? Ans- No my mass would increase too much to ever reach those speeds.

Is the front end of the plate fixed? What is it fixed to? Does it move? Ans- The components can be "bonded" but not at both contact points, it causes a "warple = warped ripple" in the spring. The contacts points on my 6 mile run this morning along the Kealia Wildlife Refuge were unbonded but mechanically attached.

The ratio between what and what? Ans- The ratio of rearfoot to forefoot distance from the spring pivot.

Perhaps the "gurus" know a trail leading to nowhere better than you do? Ans- Yes Kevin perhaps you are correct. I am sorry to have wasted your time and brain power. I was just looking for someone who could engage in a serious discussion on this important and needed technology.

Do you have a video of sagittal view of a step with the device? Ans- Yes but I was unable to upload it to this website. If you have an open mind for this I will be happy to email it to you, Eric. We do not have the funding yet to pay for your expertise.

You really are an idiot. And making it up as you go along. Next... How old are you? Twelve or thirteen? Ans- My mother was watching the first man walk on the moon the day before I was born. Idiot? Yes i am. I should be taking the vetting of this elsewhere.

Now Simon for my questions, please.
How much energy in Joules is stored and produced in the forefoot?
ie how much energy do the long flexors and short flexors provide for stabilization and propulsion at toe off?

How can we improve that?
Should we?
How many joules are released in Jerome Singleton's composite prosthesis at "toe off"?

1. Why no mention of advanced composites in Dr. Nigg's new book?
2. How can you lead if you are always looking in the Rearview Mirror of what has been done in the past?
Well i guess i should not be looking for any future referrals from you anytime too soon then ey?
1.How many joules are produced in the forefoot from the long flexors?
2. Should we try to enhance that?
3. Why is there a elevated heel on a cowgirl's boot?

At age 38 I did not want to permanently give up high energy sports and the fitness that comes with competition, a Jones Fracture can do that.So what to do?
What if we use an external simple machine say the spring orthotic device to lever the rearfoot off the ground what is causing the lift?
Is it the energy stored in the composite plate or the cantilever of the rigid craddle over a plantar pivot?
When prior students of biomechanics come forward with new idea's to solve some of the problems we face everyday what do we do? What should we do?

Mahalo,
Steve

Why is it that the podiatrists who have come onto Podiatry Arena with their sole agenda being to market their product, are always the ones to get the most upset when others don't love their product as much as they do and then go on, ad nauseum, getting into nonsensical arguments with anyone and everyone who doesn't agree with them?

The list just continues to grow longer every year.....!

__________________
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
**************************************************

I have neither the time nor the inclination to go through all of the responses you gave, Steven.
The amount of energy stored in the forefoot will vary between individuals and within individuals and will be highly task dependent. As I stated in the previous thread:
Thus the amount of energy stored in either the forefoot or long flexors will be dependent upon stiffness and displacements. The only real way to measure energy storage within the tendons should be to insert strain gauges. I am not aware of any studies which have attempted to do this in-vivo.


You can improve it by either increasing the displacement and/ or the compliance of the tissues. Whether or not we should depends on whether the demands of extra energy storage within the tissue induces pathology, which is a possibility.
I have no idea.

If by "advanced composites" you mean carbon fibre, then there is mention of it in "Dr Nigg's new book". See page 234, I'm sure there are other direct and indirect references to it within the book, but I guide you to that page and chapter for good reason. You'd do well to not only read it, but to understand the contents of that chapter.
I assume this is an attempt at some kind of straw man argument. Who do you perceive is "looking in the rearview mirror"?

No.

Already answered that. But for the record the metatarsophalangeal joints are power absorbers, that is they loose energy rather than producing it. Again, if you read p.234 of Nigg's new book, you'll see that.

The history of the heel on shoes is documented well by Cameron Kippen. You can read a little here: http://en.wikipedia.org/wiki/Heel_(shoe)
http://en.wikipedia.org/wiki/High-heeled_footwear

I guess there are many reasons for the elevated heel on a cowgirls shoe: to make them taller, to elongate the leg, to make the foot appear shorter, to exaggerate the breasts and buttocks, to place the foot in position similar to that which it adopts during orgasm, to give them something to fasten their spurs to etc etc.
You really need to read and understand the concepts of energy storage and return in footwear and orthoses. Read "Nigg's new book".

I've now spent more than enough of my time on this with you.

Keep burning your bridges and alienating people, Steven.

__________________
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."

He claims he doesn't have a photograph, let alone a video, Eric. Why can't he just take the orthoses out of his shoes take a few snaps with a camera and upload the images here?

Is it because these devices exist only on paper?

__________________
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."

What does unbonded but mechanically attached mean?



I still don't see how a biased cantilever will lift the heel faster regardless of the ratio.

Eric

Mahalo Eric,

Mechanically bonded means touching but not nessesarily fixed (or glued) together. This was important for us to add to the patent to imply we can do both.

The cantilever will not lift the heel faster or slower the amount of lift will be predicated on the ratio of the rearfoot to forefoot distance from the plantar pivot. Here is the equation for the lever from the patent. F1×D1=F2×D2

This system allows us to deepen our use of the physical sciences in our orthotic presriptions. We can adjust for a patients weight now by changing the properties/thickness of the spring plate and pivot locations.

In the back of everyones's mind is "What is in it for me? How do i make money on this?"
I don't know yet. If the brightest minds in our profession are having a difficult time with this how will others handle it? Should they be allowed to?


Thank you for your engagement and honest science.
Steve

Kingetics- Kicking Cripplism...TM
**My most awsome nurse Sheri's favorite...**

Anyone else find this little "trade-marked" tag from Steven King offensive, or is it just me?

You might want to think these through, Steven.

Kingetics- burning bridges and alienating people like its going out of fashion...TM

__________________
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."