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In a discussion of the structure of the foot, it most resembles a series of Trusses with Flexible Tie Beams (one such structure illustrated below) when static.
Structure, like the structure of a building, deals with the components of an entity and or its form when weighted.

Each truss is an important component of the system and the fact that the tie beam is flexible gives need to consider that this structure will not remain supported and stable forever.

This structure, when attached to cables (The Brooklyn Bridge), pulleys (A Tow Truck) and other engineered mechanical devices can become mechanized and functional but it remains having some form or structure.

In static stance, the foot is most like an architectural building with a single purpose, to stand and support.
When functional, there is another moment in many functional cascades (side to side, heel first, forefoot first when the main job of the foot is to statically stand and support. This wound be midstance or fully weighted heel to ball contact.

Examining the foot statically and.or in open chain (i.e. Root, Shavelson), provides a foundation upon which to develop diagnostic and treatment patterns when examining the foot functionally.

So in this structure, where is (are) the key location (s) for collapse, failure, weakness and therefore repair.

Lets label the left truss the rearfoot and the right truss the forefoot and lets call the keystone (Architectural Arch Engineering) the midtarsal joint.

In setting up a diagnostic and treatment paradigm, where would you focus the most attention?

Architecturally, I would focus on the Keystone and look for a system that defines, by subgrouping or typing, whether or not the left truss, the right truss, both or neither is collapsing, failing or weakening.

My repair, would be to shore up the trusses either using props, struts and supports like pillars or gables or strengthen and improve the bility of the flexible tie beam to keep the trusses from collapsing.

A structure mechanized by the greatest mechanics, engineers or physical scientists fashioned from a structure that is destined to fail during its lifetime would be an Architectural question that on a test would be given a grade of "F".

Dennis

 

I totally concur, however we must stop thinking of the foot as an arch. The paramiters of an arch require certain conditions, non of which pertain to the foot and it's function. This was established in 1906 by Royal Whitman and was never considered at the time. leonardo DaVinci's drawing show clearly that the foot consists of canterlevers that are slung off a sling mechanism in the tarsal region with the talus and calcaneous as extensions of the tibia.

 

No need to guess. The key location for collapse, failure or weakness with each patient will be the one which hurts. The site of injury. Different for everybody and may owe nothing to their foot type if they have an exogenic trauma.

That is also the site which requires support / reduction in workload so that it can repair itself.

Thats Tissue stress.

 

I have been working during 9 years and i tried to make sole, supports, orthotics by instances posturology orthotics supports and i must say you that the best is make with the arch that you patient have.i am learning and i dont know if i understaand you well or not ...

 

Tissue stress is related with closed kinetic chain forces of the skeletal system within the soft tissue structure. The transverse motion produced by the subtalar axis ratio and the movement of the oblique axis of the mid tarsal joint results in a compensatory mechanism of the lower limb and if insufficient compenstion is available the retrograde forced with see inherent overload in the soft tissue restraining mechanism of the foot, resulting in pain of the site and only if the forces exceed the inherent strength of the affected tissues.
Control the transverse plain motion we are able to reduce the compensatory mechanism and therefore reduce the retrogade force relieving the pathology.

 

So, everyone needs arch supports. Now, if you could only explain why different feet get different arch supports you might get somewhere. Or, do all feet get the same arch support?


Dennis, I've looked up the definition of truss and I couldn't find one that fits your usage. What's your definition of truss?


Eric

 

I guess like you looked up FFTing (LOL)

Dennis

 

So, Dennis, are you saying that you don't know the definition of truss?

I suspect that someone could learn more than you know about architecture in about an hour on the web. You appear to be misusing the terminology.
Eric