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Hello :)
There seems to be a few different types of poron. In our clinic we use the green 6mm poron for cushioning effects as an intermediate layer of the insole. I just read that you can get poron gel or poron XRD and i believe there must be other types of poron available out there. What is the difference between the three I mentioned above, if there is any, does anyone know? ;)

 

There is no difference. If you can flatten it between your fingers, what is body weight doing to it?

 

well it can be flattened between fingers naturally but it always seems to return to the same shape... so its all the same? and does the thickness of the material make any difference then?

 

Hi Craig-

Aren't the load deformation characteristics and rate of loading going to be important?
ie two materials that deform equally for a given static load may exhibit differences in deformation dependent on rate of loading.

I'm not saying that this is or isn't enough to make an obvious clinical difference in the examples asked about (not really used xrd much) but wondered if anyone had any info on situations when this may become significant?

Ian

 

Hello there,

Most of the Porons have a name or a number attached to them.

Green poron can either be the memory 96 or the 4400 and have very different properties. I have not used XRD and would not consider using it as it is too lightweight for most of my pt needs. Poron Gel is a laminate of poron 400 and a silicone gel designed to help with fatty pad reduction.

The use of material is dependant on what you are trying to achieve?

In our lab we tend to go for the 4708 with is a medical grade an i find it easier to work with are more durable that the others. We used to use a heavy duty Poron called Cleron, but they stopped making it which was a shame as it was excellent for all those pt above 12st.

PM me and we can have a chat if you want, or just give Algeos a call.

Best Wishes

Edd

 

used to love cleron, it would bevel to a a lovely finish, and yes, ideal for the heavier pt.

 

Here is my point:
If you have access to plantar pressure insole system, put the insole between your thumb and forefinger and see how much force you can generate. Then put the insole in a shoe and walk on it - look at the level of forces generated ...... we can not come close to generating the level of forces with our fingers ..... green poron can be very easily compressed between the fingers .... its going to be useless under the foot for anything. ... the force needed to compress it is so low, I don't think load deformation is even going to figure into it.

 

There are several types of poron advertised here: (http://www.algeos.com/site_search.php?term=poron).

I've only read the absract, but this paper seems to show that four types poron all reduce plantar pressures in a simillar way:

Preliminary investigation on the reduction of plantar loading pressure with different insole materials (SRP – Slow Recovery Poron®, P – Poron®, PPF – Poron® + Plastazote, firm and PPS – Poron® + Plastazote, soft)
Jasper W.K. Tonga, Eddie Y.K. Ngb

(http://www.sciencedirect.com/science/article/pii/S095825920900114X)

I found this by searching 'poron in orthotics' on google scholar.

 

Also, this paper finds that plantar pressures in diabetic patients are best reduced by using shore value 22, 27, and 32 poron, compared with 14, 17, and 55.

http://journals.lww.com/jpojournal/Abstract/1999/01120/Effect_of_Orthosis_Material_Hardness_on_Walking.7.aspx

 

Mahalo Craig,

I believe you.

Foam is Foam.

Perhaps we should place the spring orthoic device under the poron to midigate the pressure and shearing forces generated under the foot.

I have had best results of blending 3mm of cloth covered neoprene on top of 3mm poron as a top cover for our studies and prototestings. As opposed to placing the poron on top of the neoprene. Please Please No Plastizote! It is just a place filler and crazy DM shoe money maker "ie custom molded insoles" egast!

I appologize for stiring up this nice converstation.

A Hui Hou,
Steve

Kingetics-Fitting You Upright...TM

 

I can tell the difference between standing on regular 6mm grey poron and standing on salmon poron 94. I'm not sure on a force plate analysis if they will register different results but there must be something about their load/deformation characteristics that means that they differ