SUMMARY: Biomechanics/Orthopedics

From: Thomas Loebig (Allegheny-Singer Research Institute)
Date: Tuesday, May 23, 1995

From: Thomas Loebig (Allegheny-Singer Research Institute)
To: Thomas Loebig (Allegheny-Singer Research Institute), RP-ML
Date: Tuesday, May 23, 1995
Subject: SUMMARY: Biomechanics/Orthopedics
Dear RP'ers,

I know this is a long time coming, so I sincerely apologize for the delay. 
Most of what follows are more or less "leads" as most of the worthwhile
information was obtained via telephone.  Also, I've found, through browsing
the RP archives, that this very topic was addressed (I think I subscribed a
few days after) just a few weeks before I posted.  I've made contact with a
few people using SLA for Optical Stress Analysis (OSA) who have been very
helpful, and I thank you all.

The concept is pretty solid, but for us is limited by the fact that, to build
testable bone analogs with SLA, we'll be pushing the resolution of the
process (unless we scale up).  The internal architecture of bone consists of
a honeycomb-like matrix with struts on the order of 0.3mm to 1.0 mm.  SLA
resolution is reported to be about 0.5mm reproducibly, and what I've seen so
far for comparison were model supports that are quite brittle.  Scaling up
the model size or approximating the internal architecture are options.  We
remain enthusiastic and have submitted a grant application.  We hope to begin
building testable SLA Frankensteins soon.

The only option for analysis that we have at this point is to contract with
Measurements Group's Photoelastic division.  Anyone have other suggestions?

Tom
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and obtained the following replies:
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Thanks again to all who have replied.


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