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Stiffness of bone/fixation constructs

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  • Stiffness of bone/fixation constructs

    Biomechanical engineers,
    In mechanical testing of bone plus-fixator-specimens, stiffness measurements
    seem somewhat subjective. There is no distinct yield point as the fixation
    and bone tends to sequentially, not catastrophically fail. It has been
    suggested by some to derive stiffness from early in the load/displacement
    curve, after the toe. My questions are:

    1) Is it proper to derive a value for "stiffness" from the early slope of a
    load displacement curve in a destructive test?

    2) Should stiffness always be derived from a cyclic non-destructive test
    under load control?

    3) Can any value for stiffness be reported if there is no destinct yeild
    point?

    Thanks, I'll post responces.

    Karl H. Kraus, DVM Em:kkraus@infonet.tufts.edu
    Associate Professor of Surgery PH508)839-5395
    Tufts University School of Veterinary Medicine FX508)839-7922
    200 Westboro Road "I fix bones is what I do,
    North Grafton, MA 01536 I can drill, measure, tap, and screw."
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