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Related Experiment Videos

Dynamic void behavior in polymerizing polymethyl methacrylate cement.

Scott D Muller1, Andrew W McCaskie

  • 1Department of Trauma and Orthopaedic Surgery, The Medical School, The University of Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne, UK.

The Journal of Arthroplasty
|March 8, 2006
PubMed
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Cement mantle voids in hip replacements are poorly understood. This study reveals void growth is pressure-driven by monomer evaporation, not just trapped air, impacting implant survival.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Medical Device Engineering

Background:

  • Cement mantle voids are a concern for total hip arthroplasty (THA) survival.
  • The evolution and mechanisms of void formation are not well understood.
  • Current void management strategies are largely empirical.

Purpose of the Study:

  • To investigate the mechanisms of void evolution during cement polymerization in a simulated proximal femur.
  • To quantify pressure and temperature changes within voids during cement setting.
  • To elucidate the factors driving void growth in the cement mantle.

Main Methods:

  • A cement model simulating proximal femur constraints was used.
  • Intravoid pressure and temperature were continuously monitored during polymerization.

Related Experiment Videos

  • Initial and final void volumes were measured.
  • Void gas composition was analyzed at peak pressures.

    • Main Results:

    • Temperature-dependent peak intravoid pressures and void volume increases were observed.
    • Subatmospheric intravoid pressures were recorded after cement solidification.
    • Observed pressure changes could not be explained by the ideal gas law alone.
    • Gaseous monomer significantly contributed to partial pressures within voids.

    Conclusions:

    • Void growth in THA cement is a pressure-driven phenomenon.
    • Temperature-dependent monomer evaporation into existing air voids drives void expansion.
    • Understanding these mechanisms can inform strategies to minimize voids and improve implant longevity.