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Related Experiment Videos

Metal/cement interface strength in cemented stem fixation.

A M Ahmed, S Raab, J E Miller

    Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
    |January 1, 1984
    PubMed
    Summary
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    The interface strength between metal implants and bone cement is crucial for implant longevity. Precoating metal implants with polymethylmethacrylate significantly enhances bond strength and prevents degradation in saline environments.

    Area of Science:

    • Biomaterials Science
    • Orthopedic Engineering
    • Fracture Mechanics

    Background:

    • The interface between stem-type metal implants and bone cements is critical for long-term orthopedic implant success.
    • Understanding and improving this interface strength is essential to prevent implant loosening and failure.

    Purpose of the Study:

    • To characterize the interface strength between metal implants and bone cements using fracture mechanics.
    • To evaluate the effect of bone type (cortical vs. cancellous) and saline immersion on interface strength.
    • To assess the impact of polymethylmethacrylate (PMMA) precoating on metal implant-cement interface durability.

    Main Methods:

    • Utilized the critical strain energy release rate (Gc) as a fracture mechanics parameter to quantify interface strength.

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  • Performed
  • push-out
  • tests on cylindrical specimens at body temperature.
  • Investigated interfaces formed with both cortical and cancellous bone, and assessed degradation after 60 days of saline immersion.

    • Main Results:

    • Interface strength was significantly lower with cancellous bone compared to cortical bone.
    • Saline immersion markedly degraded the interface strength of uncoated SS316LVM/cement interfaces, reducing Gc to 10-20% of bulk cement values.
    • PMMA-precoated metal implants (SS316LVM, Co-Cr-Mo, Ti-6A1-4V) exhibited Gc values one order of magnitude higher than uncoated metals.
    • Precoated SS316LVM/cement interfaces maintained their strength after 60 days of saline immersion.

    Conclusions:

    • Bone type significantly influences the metal-cement interface strength, with cortical bone providing a stronger bond.
    • Uncoated metal-cement interfaces are susceptible to degradation in physiological saline environments.
    • Polymethylmethacrylate precoating offers a substantial improvement in interface strength and durability, crucial for long-term implant performance.