Hello Philip,
Before testing the efficacy of two types of insoles with a pressure
measuring system, you should first state what functional problem this
system is aiming to correct. For example, for diabetic patients maximal
pressure reading on meta heads and heel are important to analyze. A
functional hallux limitus may force you to look at the pressure ratio
between hallux and 1st met head etc....
Also clinical experience show that symmetry of pressure and loading rate
patterns between left and right tends to produce positive results,
especially if leg length differences or hip torsion is present. As for COP
position and velocity , research has shown that these variables are not
really reliable, though they may be of clinical relevance when analyzing
frontal rearfoot motion.
But as a rule I always look at the maximal pressures on the metas and
medial and lateral heel, the corresponding loading rates and the time from
initial foot contact to peak pressure and peak loading rate. The duration
of the heel contact phase, the midstance and propulsion relative to stance
may be interesting too.
I am sure Bruce and Howard may add some additional variables of interest.
But as for the CoM module of the F-scan and the respective Gait Efficiency
Index, Norman knows he still owes me a scientific explanation and
evidence for the selection and validity of the variables involvedin the
CoM module as purity, symmetry, conservation and global efficiency or gait
perfection. These are interesting and probably also reliable mathematical
gait parameters, but I still have problems to relate them to the physical
nature of gait. They represent nice and well defined mathematical
variables, but what do they really represent ? How do they relate to gait
in a physical and not only in a mathematical manner ? They have nice
names too, but l what is in a name.
I hope Norman is listening and I am sure that we may find some agreement
after drinking a proven and evidence based selection of Belgian beers,
also with nice names.
Regards to all,
Bart
>I am in the process of attempting research into the efficacy of a Total
>Contact EVA orthoses. This will be done 1st via a pilot study, then via a
>multi disciplinary and multi centre approach.
>The research is comparing two different types (Low density v's a
>high/medium/low - heel to forefoot - multi density EVA) and I would like
>to use the F-Scan system to evaluate them.
>I have limited experience in using the F-Scan but would like to look at
>the velocity of the centre of pressure and using the CoM annylsis software.
>Any other variables worth looking at?
>
>What I would like help with is the creation of a protocol that would give
>reliable and valid data - especially due to the multi centre approach.
>
>Could anyone with experience in this area - either research or clinical
>use of the F-Scan - point me in the right direction
>
>Thanks alot
>
>Philip Wells
>
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>I am in the process of attempting research into the efficacy of a Total
>Contact EVA orthoses. This will be done 1st via a pilot study, then via a
>multi disciplinary and multi centre approach.
>The research is comparing two different types (Low density v's a
>high/medium/low - heel to forefoot - multi density EVA) and I would like
>to use the F-Scan system to evaluate them.
>I have limited experience in using the F-Scan but would like to look at
>the velocity of the centre of pressure and using the CoM annylsis software.
>Any other variables worth looking at?
>
>What I would like help with is the creation of a protocol that would give
>reliable and valid data - especially due to the multi centre approach.
>
>Could anyone with experience in this area - either research or clinical
>use of the F-Scan - point me in the right direction
>
>Thanks alot
>
>Philip Wells
>
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>All opinions and assertions contained in this message are those of
>the original author. The listowner(s) and the JISCmail service take
>no responsibility for the content.
>
>to leave the Podiatry email list send a message containing the text
>leave podiatry
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*******************************************************************
Bart Van Gheluwe
Laboratory of Biomechanics
Vrije Universiteit Brussel -Fac. LK
Vakgroep BIOM
Pleinlaan 2, 1050 Brussel, Belgium
Tel.: 02/629.27.33 (31)
Fax: 02/629.27.36
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