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Related Experiment Videos

Cracks emanating from a fluid filled void loaded in compression: application to the bone-implant interface.

M H Santare, L M Keer, J L Lewis

    Journal of Biomechanical Engineering
    |February 1, 1987
    PubMed
    Summary
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    Orthopedic implant loosening can stem from bone-cement interface fractures. This study models crack growth from fluid-filled voids under compressive loads, identifying conditions promoting failure.

    Area of Science:

    • Orthopedic biomechanics
    • Materials science
    • Fracture mechanics

    Background:

    • Orthopedic implant loosening is a significant clinical issue.
    • Fracture at the bone-cement interface contributes to implant failure.
    • Loosening can occur even under compressive loading conditions.

    Purpose of the Study:

    • To model crack initiation and propagation from fluid-filled voids at the bone-cement interface.
    • To investigate the role of compressive loads and fluid pressure in promoting interfacial fracture.
    • To determine the conditions under which cracks are likely to grow, leading to implant loosening.

    Main Methods:

    • Development of a mathematical model for crack growth from elliptical voids.
    • Inclusion of incompressible fluid penetration into cracks under compression.

    Related Experiment Videos

  • Calculation of mode I stress intensity factors.
  • Numerical solution of singular integral equations using piecewise quadratic polynomials.

    • Main Results:

    • The model predicts crack growth from fluid-filled voids under compressive loading.
    • Fluid penetration significantly influences the stress state at the crack tip.
    • Specific combinations of void geometry, fluid properties, and applied load promote crack propagation.

    Conclusions:

    • Compressive loading does not preclude crack growth at the bone-cement interface.
    • Fluid-filled voids are critical sites for initiating fractures leading to orthopedic implant loosening.
    • The developed model provides insights into the mechanisms of implant failure and can inform future implant design.