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Related Experiment Videos

Postmortem transition in the dynamic mechanical properties of bone

E R Fitzgerald

    Medical Physics
    |January 1, 1977
    PubMed
    Summary

    Researchers observed a distinct transition in bone

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    Area of Science:

    • Biophysics
    • Materials Science
    • Orthopedics

    Background:

    • Bone exhibits complex viscoelastic properties.
    • Understanding bone's mechanical behavior post-mortem is crucial for various applications.

    Purpose of the Study:

    • To investigate the dynamic mechanical properties of bone.
    • To identify any transitional changes in bone compliance after death.

    Main Methods:

    • Measurements of dynamic shear compliance were performed.
    • Experiments were conducted at room temperature over time after death.
    • Audio-frequency complex shear compliance (J*b = Jb' - iJb") was analyzed.

    Main Results:

    • An abrupt, second-order transition was observed in rabbit and human bone samples.
    • This transition occurred approximately 5 hours post-mortem.
    • The transition affected components of the complex shear compliance.

    Conclusions:

    • The observed transition indicates a significant change in bone's mechanical properties.
    • This phenomenon is proposed as a marker for the life-to-death transition in bone.
    • Findings contribute to understanding post-mortem bone biomechanics.

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