Vernon;
You can certainly test for a LLD using static pressure analysis. But is
the outcome truly repeatable and does it really correlate. I agree that
most people will tend to shift their weight to the more stable short limb
side when they stand relaxed. I have seen this repeatedly in Yoga class
where everyone is unstable on their long sided limb, and more stable on the
short side (observation, not controlled!).
I would agree with Bart though, that it might be best to correlate the
static images w/ a functional image. As Howard and Bart said too, noting
changes in acceleration patterns, is not always consistent with long
limb/short limb. Sometimes the patterns are everted.
What I've found lately since really delving into LLD more is that much
of the functional LLD is easily controlled w/ good form fitting devices w/
first ray c/o's. The more proximal the problem though (i.e. back pain,
hips, knees, etc.) the more likely you are to need to use a heel lift
though.
My observations!
Sincerely;
Bruce Williams
----- Original Message -----
From: "lever" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, September 20, 2004 11:27 AM
Subject: Re: Pressure measurement and LLD's
> Dear Bart
>
> Are you saying that one cannot measure LLD statically?.
> My question to you is why?.
>
> I know that the most repeatable way to measure for LLD is to do a
scanogram,
> but why would static weight on a force plate not work?.
>
> Regards,
>
> VERNON LEVER (BSc.Hons. N.D.Pod.S.A.)
> P.O.BOX 751380
> Gardenview 2047
> Gauteng
> South Africa
> Tel: W) 011-622-4680
> Cellular phone: 082-410-5249
> E-mail: [log in to unmask]
> ----- Original Message -----
> From: "Bart Van Gheluwe" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, January 03, 1904 2:17 AM
> Subject: Re: Pressure measurement and LLD's
>
>
> > Hello Gareth,
> >
> > If you want to analyze LLD with a plantar pressure measuring system,
> > you better do it with walking, not statically. LLD mostly shows up
> > through a left-right asymmetry of the pressure distribution. An
> > easy indicator of LLD is a longer propulsion time (or shorter heel
> > contact time) for the shortest leg though sometimes the inverse may
> > occur.. Secondary indicators are a reduced peak heel pressure and a
> > more lateral position of the CoP.
> > Be aware, however, that the above applies to a * functional* LLD,
> > though structural LLD mostly causes a functional LLD too.. One should
> > keep in mind that a functional LLD can be introduced without a
> > structural LLD being present, because a functional LLD can be
> > introduced by pronation , functionally shortening the leg, or by
> > invertion, functionally lengthening the leg .
> > We determine structural LLD by inspecting the SIAS and PSIAS height
> > statically and check if a positive LLD appears on the pressure
> > recordings. If they do, we will correct, otherwise we assume that
> > they are properly compensated for , especially if there are no
> > further complaints.
> >
> > I also hope that Howard and Bruce my fill in with some more useful
> suggestions.
> >
> > If more questions, feel free to ask. ( I am also using a Footscan
system)
> > Regards,
> > Bart
> >
> >
> >
> >
> >
> >
> >
> > >Mailbase,
> > >
> > >We have been using the RS Scan pressure mesurement
> > >system for additional analysis alongside SiliconCoach
> > >to help assess gait.
> > >
> > >Recently we have been using it to measure the pressure
> > >differences of patients that have LLD while standing
> > >static. Heel raises of varying heights have been
> > >placed under the shorter leg showing up a balance in
> > >pressure through the rear-foot.
> > >
> > >Does anyone have anything to add to this topic, trends
> > >they have seen? Or alternatively evidence they have
> > >obtained?
> > >
> > >regards,
> > >
> > >Gareth
> > >
> > >=====
> > >Gareth Milne
> > >PODIATRIST
> > >
> > >Sportsmed
> > >156 Bealey Avenue
> > >Christchurch
> > >New Zealand
> > >
> > >+64 3 366 0620
> > >+64 21 136 1244
> > >
> > >Find local movie times and trailers on Yahoo! Movies.
> > >http://au.movies.yahoo.com
> > >
> > >-----------------------------------------------------------------
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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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