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d3uk61
05-25-2009, 09:52 PM
Dear Vahedeh

Two things to ask you

1) Where do you wish to measure the changes in pressure, that is, which
interfaces are of interest?


2) In terms of a "suitable outcome measure", what pathology do you wish to
address.

Obviously you can compare two devices in terms of the differences in
pressure charcteristics at some interface of interest but what does that
mean in terms of change in pathology of interest.

If you were looking at Ankle Foot Orthoses (AFO) for reduction of plantar
pressure in diabetic or neuropathic subject for instance, perhaps a partial
foot amputee, then obviously measuring the change in plantar pressure would
be a good place to start. You might want to decide first though what aspect
of plantar pressure actually contributes to the pathology you are
addressing. I.E. Peak pressure, mean peak pressure, pressure integral, or is
it the plantar pressure at all ? i.e. it might be shear forces, which are
not characterised by a pressure measuring system.

On the other hand if your subjects pathology of interest was frontal plane
instability, e.g. peroneal muscle weakness leading to continual and
traumatic inversion sprains, then plantar pressure changes per se may not be
very useful incharacterising the change in moments about the sub talar
joint.
Although if the dynamic Centre of Pressure was seen to move from the medial
foot to the lateral aspect post intervention, then this might be a postive
indication that there is probably less tendency to supinate, however only
the study of 3D forces and their resultant vector will tell you for sure.

What is FSR?

Tekscan (tekscan.com) are a good manufacturer of pressure measuring devices
for all sorts of interfaces.

Cheers

Dave Smith Podiatrist MSc App Biomechanics
FootHouse
18 Radnor Park Ave
Folkestone
Kent
foothouse.co.uk



----- Original Message -----
From: "Vahideh Moradi"
To:
Sent: Monday, May 25, 2009 7:24 PM
Subject: [BIOMCH-L] FSR & pressure distribution


Dears

My name is Vahideh Moradi and I am a Master student in Orthotics and
Prosthetics at Iran University of Medical Sciences. I am working on
comparing custom-made AFOs and prefabricated AFOs. According to my searches
the pressure distribution might be a suitable “outcome measure” for this
comparison and it has been employed as a comparison method for other
orthoses such as Foot Orthoses. So I am wondering, to your opinion, if
pressure distribution can serve as a outcome measure to determine the
differences between these two methods of manufacturing. On the other hand,
which instrument would you suggest for measuring pressure distribution my
feeling is that FSR will be a good method and I appreciate your idea
regarding advantages and disadvantages of this method?

Your help is much appreciated



Vahideh Moradi
Ms. student
Faculty of Rehabilitation Sciences
Department of Orthotics and Prosthetics
Iran university
Shahnazari St .Madar Square Mirdamad Blvd.
Tehran.Iran