Bart and Jay;
Bart's device is already practical w/ use of the F-scan I believe. It
might not be exactly the same but I feel that it would probably not skew the
data by increasing the height of the 1st met by using the 1/16" ppt. I know
I don't have the details of how this force device Bart is describing will
work compared to pressure w/ F-scan, but I'd think there would be some sort
of happy medium?
Bruce
----- Original Message -----
From: "Bart Van Gheluwe" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 14, 2004 7:00 AM
Subject: Re: Some further reflections on Metatarsal Ray Dorsiflexion
Stiffness
> Dear all,
>
> Jay ended his message with the words::
>
> >I think you have me sold on the "stiffness" term. Now
> >I think we should evaluate the unit or method by which
> >we can communicate this variable.
>
>
> And that is exactly my point. How will we do that in a way that can be
> implemented during a normal podiatric session ?
>
> I tried to come up with something simple. How do you like the following
> device.
> Everybody normally has some sofft PPT like material of different densities
> around. Cutting a small piece of a square centimeter and glueing a stiff
> thin plate at the top and the bottom end of it, produces a crude pressure
> measurement device.
> Next step is to calibrate this "load cell" by loading it with known
weights
> till top and bottom plate are at their closest position, with the soft
> material maximally flatten. Sophisticating the devise attaching a small
> scale at the side of the device enables intermediate readings.
> Using different material densities produces load cells with different
> sensitivities.
> Now, in order to measure stiffness of the first ray, we proceed as usual
as
> for measuring 1st ray mobility according to Root, but with the load cell
> under the 1st meta head. Monitoring the deflection of the 1st meta with
> the load cell maximally ( or partially when using the attache scale
> division) flatten, enables a crude estimation of the joint stiffness.
> I did not try this device, it is just a first mental exercise. Who is
> willing to try it out or come up with a different solution? The
> competition for the best hobyist among us is open.
>
> Have fun,
> Bart
>
> *******************************************************************
> 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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