Bart wrot in response to Kevin,
>Nice piece of biomechanical logic. Good example for teaching the students
some gait biomechanics. I enjoyed it.
I am looking forward to the new edition of the Intricast Newsletters. I
hope it contains more gems like this<
This was as usual an excellent hypothetical explanation but should be
studied as a "nice piece of biomechanical assumption"! Nevre the less
excellent. Bruce's explanation is equally as good:
>. Abduction is usually the method of choice in avoiding a locked 1st mpj
that has FHL. It is interesting to note as well, that at heel strike most
of these people are already abducting. This indicates to me that there
bodies have learned from there proprioceptors, over time, that they have to
avoid the 1st mpj. Patients that can walk thru the 1st mpj have no reason
to abduct excessively. They can toe off normally. <
I would add that an in-toe effect can be seen wtih internally rotated hip
positions as an avoidance for FHL. Also, simply adding an FHL accommodation
with no rear foot modifications to an orthoses appears to improve this
situation well! If the FHL was caused by the STJ position this would not
resolve as effectively without some rear foot control...Perhaps!
Happy festivities to one and all.
Graham
----- Original Message -----
From: Bart Van Gheluwe <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 12, 2001 9:25 AM
Subject: Re: Abductory twist
> Kevin , you wrote :
>
> << I would like to offer another explanation for the biomechanical
> etiology of abductory twist which is slightly different from Howard's. I
> have lectured on this phenomenon for the last fifteen years and I think
> that understanding the concept of rotational forces (i.e. moments) acting
> across the subtalar joint (STJ), hip and knee joints greatly adds to the
> understanding of this commonly observed gait phenomenon. In order to
> describe the mechanics of abductory twist with the greatest clarity,
> abductory twist...
> <<<
>
> Nice piece of biomechanical logic. Good example for teaching the students
> some gait biomechanics. I enjoyed it.
> I am looking forward to the new edition of the Intricast Newsletters. I
> hope it contains more gems like this.
>
> Regards,
> 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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