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Related Experiment Videos

Retrieved total hip prostheses: part II. Wear behaviour and structural changes.

H Oonishi1, E Tsuji, Y Y Kim

  • 1Department of Orthopaedic Surgery, Artificial Joint Section and Biomaterial Laboratory, Osaka-Minami National Hospital, Osaka, Japan.

Journal of Materials Science. Materials in Medicine
|September 7, 2004
PubMed
Summary
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Gamma irradiation significantly reduces wear in cross-linked polyethylene hip prostheses. This advanced material shows minimal surface damage compared to non-irradiated polyethylene, improving implant longevity.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Materials Engineering

Background:

  • Total hip prostheses utilize polyethylene components that are susceptible to wear over time.
  • Wear debris from polyethylene can lead to osteolysis and implant loosening.
  • Cross-linking and gamma irradiation are strategies to enhance polyethylene durability.

Purpose of the Study:

  • To evaluate the wear characteristics of gamma-irradiated cross-linked polyethylene cups in retrieved total hip prostheses.
  • To compare the surface morphology of gamma-irradiated and non-gamma irradiated polyethylene components.
  • To assess the impact of different femoral head materials and sizes on polyethylene wear.

Main Methods:

  • Analysis of retrieved total hip prostheses cups (Charnley 22 mm, Bioceram 28 mm, Müller 32 mm) using naked-eye and scanning electron microscopy.

Related Experiment Videos

  • Inclusion of cross-linked polyethylene cups irradiated with high doses of gamma radiation (100 Mrad).
  • Comparison with retrieved total knee prostheses surfaces for reference.

    • Main Results:

    • Non-gamma irradiated cups showed significant surface damage: carpet-like fibers, scratches, and crevices, varying with femoral head size.
    • Gamma-irradiated cups exhibited a smooth, rippled surface (approx. 0.1 microm) with no signs of scratching, flaking, or delamination.
    • The number of observed crevices was lower for the 32 mm ball compared to 22 mm and 28 mm balls on non-irradiated surfaces.

    Conclusions:

    • Gamma irradiation of cross-linked polyethylene effectively minimizes wear in total hip prostheses.
    • Irradiated polyethylene demonstrates superior resistance to surface degradation compared to non-irradiated counterparts.
    • These findings suggest improved long-term performance and reduced risk of wear-related complications for gamma-irradiated implants.