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Related Experiment Videos

Fluid-sorption phenomena in sterilized polyethylene acetabular prostheses.

I C Clarke, W Starkebaum, A Hosseinian

    Biomaterials
    |May 1, 1985
    PubMed
    Summary

    Fluid sorption in polyethylene acetabular sockets occurs in two phases. Ultra-high molecular weight polyethylene and carbon-fibre-reinforced polyethylene showed distinct absorption rates, with sterilization having minimal impact.

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    Area of Science:

    • Biomaterials Science
    • Polymer Chemistry
    • Orthopedic Engineering

    Background:

    • Acetabular sockets are crucial components in hip replacements.
    • Understanding fluid sorption in polyethylene is vital for implant longevity.
    • Radiation sterilization can potentially affect material properties.

    Purpose of the Study:

    • To quantify fluid sorption in radiation-sterilized acetabular sockets.
    • To compare fluid absorption rates between different polyethylene materials.
    • To assess the impact of sterilization on fluid sorption.

    Main Methods:

    • Weight changes were measured in 62 radiation-sterilized and 10 unsterilized acetabular sockets and discs.
    • Materials tested included ultra-high molecular weight (UHMW) polyethylene and carbon-fibre-reinforced polyethylene (CFPE).

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  • Fluid absorption was monitored over 400 days in water and serum.

    • Main Results:

    • Fluid absorption followed a biphasic curve for all materials.
    • Initial absorption rates (0-30 days) were higher for CFPE than UHMW polyethylene.
    • Later absorption rates (beyond 30 days) were significantly lower and linear for both materials.
    • Sterilization had minimal effect on fluid absorption rates.
    • Soak rates were higher in water than in serum.

    Conclusions:

    • Polyethylene acetabular sockets exhibit predictable biphasic fluid sorption.
    • CFPE shows a higher initial fluid uptake compared to UHMW polyethylene.
    • Long-term fluid sorption is minimal, suggesting good dimensional stability.
    • Radiation sterilization does not significantly alter fluid sorption characteristics.