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Related Concept Videos

  • Engineering
  • Materials Engineering
  • Wearable Materials
  • Correlation Of Cross-linking As Measured By The Trans-vinylene Index And In Vitro Wear Of Polyethylene From Various Acetabular Liner Brands.
  • Engineering
  • Materials Engineering
  • Wearable Materials
  • Correlation Of Cross-linking As Measured By The Trans-vinylene Index And In Vitro Wear Of Polyethylene From Various Acetabular Liner Brands.

    • Related Experiment Video

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    Correlation of cross-linking as measured by the trans-vinylene index and in vitro wear of polyethylene from various acetabular liner brands.

    Peter Wahl1,2, Roman Heuberger3, Andrea Pascucci3,4

    • 1Division of Orthopaedics and Traumatology, Cantonal Hospital Winterthur, Winterthur, Switzerland.

    Bone & Joint Research
    |November 26, 2024

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    The trans-vinylene index (TVI) reliably measures cross-linking in highly cross-linked polyethylene (HXLPE) implants, showing lower wear with higher TVI. Manufacturing variations impact cross-linking and wear resistance in total hip arthroplasty components.

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    Area of Science:

    • Biomaterials Science
    • Orthopedic Surgery
    • Polymer Chemistry

    Background:

    • Highly cross-linked polyethylene (HXLPE) is used in total hip arthroplasty to reduce wear compared to conventional polyethylene (CPE).
    • Cross-linking is typically achieved through irradiation, but variations in manufacturing processes can affect the degree of cross-linking and subsequent performance.

    Purpose of the Study:

    • To compare the degree of cross-linking and in vitro wear rates of retrieved and unused HXLPE acetabular cups/liners from various brands.
    • To evaluate the reliability of the trans-vinylene index (TVI) as a measure of absorbed irradiation dose over time in vivo.

    Main Methods:

    • Fourier-transform infrared spectrometry was used to determine the trans-vinylene index (TVI) and oxidation index (OI) of 47 polyethylene acetabular cups/liners from ten brands.
    • In vitro wear was measured using a pin-on-disk test.
    • Absorbed irradiation dose was calculated from TVI and compared to product specifications.

    Main Results:

    • The TVI was found to be independent of time in vivo and showed a strong linear correlation with older TVI standards (R² = 0.995), except for vitamin E-containing polyethylene.
    • Calculated absorbed irradiation doses generally matched product specifications, with notable deviations in two electron beam-irradiated and gamma-irradiated HXLPE samples.
    • A non-linear, inverse correlation was observed between TVI and in vitro wear, with lower wear rates associated with higher TVI values.

    Conclusions:

    • The TVI is a dependable indicator of absorbed irradiation dose in HXLPE, unaffected by time in vivo.
    • Variations in manufacturing processes and irradiation methods (electron beam vs. gamma) influence cross-linking characteristics and potentially wear resistance.
    • HXLPE with lower TVI exhibited reduced wear resistance, becoming comparable to conventional polyethylene (CPE).