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All, I found this today while looking for something else. I think this should be a must read for all podiatrists with an interest in biomechanics:

http://ptjournal.apta.org/content/82/4/383.full.pdf

Letter to the editor in response to this paper and the authors reply here:
http://ptjournal.highwire.org/content/82/8/824.full

 

This is a gem. Thanks big dog.

 

No worries. Can't believe that I'd not found this beauty before.
"Looked a lot like Evengelista
Strange to think I'd ever miss her....So"- Lucy Jones part 1: Aslan

 

Starting from next two statements:

1. "Foot orthoses are believed to exert their therapeutic effect on the human locomotor apparatus by altering the location, magnitude, and temporal patterns of ground reaction forces acting on the plantar foot during weightbearing activities " [ from In-Shoe Pressure Measurement and Foot Orthosis Research, J Am Podiatr Med Assoc 100(6): 518-529, 2010]

2. In Mr. Mueller's article foot orthotic devices are an extrinsc factor "Affecting the Level of Physical Stress on Tissues or the Adaptive Response of Tissues to Physical Stress" [table 2, pg 385] ?

In don't understand if the "adaptive response of tissue to psyhical stress" is implicit from the first statement [1] or it have to be added to it in order to give a more complete image of how foot orthoses exert their therapeutic effect ! Could you give me some thoughts ?

Sincerely,
Daniel

 

Daniel I´m not sure if this answers exactly what your asking.

In the 1st statement thats what the authors are saying how an orthotic works, the results in this change of the location, magnitude, and temporal patterns of ground reaction forces it is hoped that the level of physical stress on the pathologic tissue will be reduced and thus having the therapeutic effect required.

Does that help ?

 

Thank you Michael,

In my mind the "adaptive response of tissue to psyhical stress" is more powerful related to subjective [specific] response to orthotic therapy than the change of the location, magnitude, and temporal patterns of ground reaction forces are.

Daniel

 

But then what causes the adaptive response of tissue re the inclusion of an orthotic device in a treatment program ?

 

I'm having a hard time getting my head around adaptive response of tissues to physical stress. Is this hypertrophy of muscle or is it stress fractures in bones or what? The first statement is looking at the foot at one point in time and analyzing the foot and stresses at that point in time. As long as you are not talking about a traumatic event, like bone fracture, the response of tissues to stress occurs over time. I don't really see what adding "adaptive response" does for the tissue stress theory.

Eric

 

I'm thinking at these two statements from Nigg:
-1. "Impact forces are an input signal characterized by amplitude, frequency and time"
-2. "The effects are subject specific and depend on the characteristics of every single soft-tissue compartment"


Daniel