Dear Aziz:
I am very glad to communicate with you. I am Sun Chung in Seoul. May I
answer your question to Gideon?
> > In the HHm/Anthro item 23/24
> > the Right anterior - posterior ASIS/HJC component (m), what
this means?
This anthropometric data can be measured manually. We take a point on
the
superior part of greater trochanter(GTroch) by palpation. And draw a
vertical line from the point, "vertical" assuming that the
subject are
standing. We measure the shortest distance between this line to the
ipsilateral ASIS. You may have some problem to locate the GTroch point
because it is somewhat blunt. Which point should we choose in this
rather
blunt bony landmark? To solve this problem, we may look over the
original
article of Roy Davis (Davis RB et al. A gait analysis data collection
and
reduction technique. Human movement science 1991(10): 575-587). They
took
this GTroch point for the hip joint center in sagittal plane. Dr.
Perry
wrote on her book "Gait analysis" that the hip joint center
overlies at the
anterior superior margin of the GTroch(Page 368, figure-17.7). So, I
usually
recommend to take the anterior point of GTroch. What do you think?
Actually, I do not like this approach (Roy Davis's approach) to
estimate hip
joint center.
1. The measurement(GTroch to ASIS) is too error
prone.
2. The hip joint center in sagittal plane will be
influenced by the
amount of femoral anteversion, which varies individually.
3. As you can see on the article, their data were
based on only the
children's pelves.
4. They did not report any detailed method to take
the x ray and
measurement for their estimation.
I had tried to reproduce their result with Korean adult pelves. But
failed
to.
I prefer Bell's approach but it is not the best. I hope we can have
the best
way to estimate the hip joint center in the near future. Would you
like to
read this page
Only if you may be ready to read broken English.;-)
May I have a question? You said that you use 4 cameras to get HHm
marker
set. Do you have any problem to digitize the heel markers? If the
answer is
"yes", will you be so kind to share your know-how with me?
It was very
difficult for me to digitize the heel markers when I used 4 cameras. I
solved that problem by taking "virtual heel markers".
I hope this would be helpful to you.
Looking forward to hearing from you.
Sincerely,
------------------------------------------------------------
Sun G. Chung M.D., Ph.D.
Full Time Instructor
Dept.Rehab medicine, Seoul National Univ Hospital
28 YeonGeon-dong, ChongRo-gu
Seoul,Korea
(TEL) 82-2-760-3954 (FAX) 82-2-743-7473
email: suncg@plaza.snu.ac.kr
> Hi Aziz:
> Thank you for your message. I am really happy that you like the
APASgait.
It
> is really a fantastic system.
> The three main developers of the system are Dr. Sun
Chung, MD, Rudolf
> Buijs, and Erik Simenson, Ph.D.
> I am forwarging your message to them and I am sure you will
receive a
quick
> response. We all very much want to work with you with the
APASgait.
> Also, do not miss Dr. Chung web site at:
>
>
> Which show all the foundations of our APASgait and the different
> measurement.
> The APASgait price is $5000. I cannot do too much about it
since we pay
> most of it in Royalties. However, I will thorow the Rendere which
cost
$1500
> with it for free.
> Check the Renderer at:
>
> /Renderer/index.html
>
> How does this sound?
> Please let me know if you receive the answer.
> All the best and have a nice day
> Gideon
>
> ----- Original Message -----
> From: "a.rahmatalla" <a.rahmatalla@keele.ac.uk>
> To: "Gideon Ariel" <gideon@arielnet.com>
> Sent: Monday, June 12, 2000 7:38 AM
> Subject: Re: Gait program
>
>
> > Dear Gideon,
> > After initial problems, gait program seems to work well and
I like it. I
> > have tried it with the original Vaughan set, however it work
better with
> the
> > HHm and this might be due to the fact that I am using 4
cameras at the
> > moment. My colleague and I are working to evaluate the
program on a
sample
> > of subjects and will let you know the outcome soon. I have
little
question
> > regading one input which I am not sure about. In the HHm/Anthro
item
23/24
> > the Right anterior - posterior ASIS/HJC component (m), what
this means?
> how
> > you measure it? does x-ray is needed or is done by an
estimation? please
> let
> > me know.
> >
> > The other point I wolud like to raise with you is, since I
like this
> program
> > and found it useful, I would like to purchase it as an added
module to
my
> > existing APAS. I will leave this for your generosity and
judgement to
> decide
> > the price.
> >
> > It is alway pleasure to talk to you. My sincere regards to
John and all
> > Ariel crew.
> >
> > Yours sincerely
> > Aziz Rahmatalla
> >
> > ----- Original Message -----
> > From: Gideon Ariel <gideon@arielnet.com>
> > To: A. Rahmatalla <a.rahmatalla@orth.keele.ac.uk>
> > Cc: Rudolf J.C. Buijs <rudolf@sportsci.com>
> > Sent: Tuesday, May 23, 2000 11:31 PM
> > Subject: Re: System parameters
> >
> >
> > > Hi Aziz:
> > > You must download the Java drivers.
> > > Please read at:
> > > /Gait/index.html
> > >
> > > You must un-install any Java drivers and then follow
the directions.
> > > The reason for the 60 days is that the Gait is only on
trial period of
> 60
> > > days.
> > > This cause the others to respond the same.
> > > However, if you decided to buy or not to buy the Gait
program, then
you
> > just
> > > let us know and we will issue you
> > > a permanent site key accordingly.
> > > The Gait program which is the trial version cause
that.
> > > Have a good day
> > > Gideon
> > >
> > > ----- Original Message -----
> > > From: A. Rahmatalla <a.rahmatalla@orth.keele.ac.uk>
> > > To: <gideon@arielnet.com>
> > > Cc: <osa10@keele.ac.uk>
> > > Sent: Tuesday, May 23, 2000 9:07 AM
> > > Subject: Re: System parameters
> > >
> > >
> > > > Dear gideon
> > > > I have used the site code as usual, It worked only
once then problem
> > > > started. Every time I try to open the apas gait,
the computer
crashes
> > with
> > > > no response to any command. This does not occur
when I use other
> > > programmes
> > > > including other apas modules. The other thing I
have noticed is that
> > other
> > > > modules of my existing Apas changed from unlimited
licence to 60
days
> > > > trial!. I am sure there must some errors
somewhere. Please let me
if
> > > there
> > > > someone reported similar problems.
> > > >
> > > >
> > > > Yours sincerely
> > > >
> > > > Aziz
> >
>
>
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