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Fwd: responses on how important is the displacement?

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  • Fwd: responses on how important is the displacement?

    --- Arnel Aguinaldo wrote:
    > Date: Wed, 13 Oct 1999 13:17:03 -0700
    > To: Boon Kam
    > From: Arnel Aguinaldo
    > Subject: Re: how important is the displacement?
    >
    > Dear Kim:
    >
    > I believe displacement is important in mechanical
    > testing of various
    > in-bone screws, but it really depends on what your
    > test objectives are. For
    > example, I've done tests with ACL surgeons who
    > simply wish to find out if
    > the screws and/or the tendon grafts pull-out at
    > certain peak levels (& at
    > what levels), regardless of displacement
    > measurement. They simply want to
    > know if the screw would hold in place at peak levels
    > above physiological
    > and biomechanical norms. In ACL reconstruction, such
    > data is invaluable in
    > determining which screws, grafts (i.e., patellar,
    > ST), or combination
    > thereof is optimal for compatible patients.
    >
    > I hope this helps and good luck!
    >
    > Arnel
    >
    > =======================================
    > Arnel Aguinaldo, M.A.
    > Biomechanical Engineer
    >
    > San Diego State University
    > University of California, San Diego
    > San Diego, CA
    > http://sd.znet.com/~ala/resume.htm
    > =======================================
    >
    > At 09:06 PM 10/12/99 -0700, you wrote:
    > >Dear biomch friends,
    > >
    > >When a pullout test is carried out, how important
    > is
    > >the displacement? For example, if a 12mm screw was
    > >inserted, a highest peak of 300N at a displacement
    > of
    > >3mm. The peak falls tremendously to zero and below
    > >zero, after it hits the 300N before it even reaches
    > >the displacement of 6mm.
    > >
    > >Can anyone explain , please?
    > >
    > >Your kindness reply is very much appreciated.
    > >
    > >Thank you very much.
    > >
    > >Sincerely,
    > >Kim
    >


    =====

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