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Do first-generation highly crosslinked polyethylenes oxidize in vivo?

Daniel MacDonald1, Ashlyn Sakona, Allyson Ianuzzi

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Highly crosslinked polyethylene shows promising clinical results within ten years. However, monitoring oxidation in annealed and remelted liners is crucial for long-term joint replacement survival.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Polymer Chemistry

Background:

  • Highly crosslinked polyethylenes (HXLPE) aim to reduce wear and osteolysis in joint replacements.
  • Crosslinking improves wear but can introduce free radicals, leading to oxidation.
  • Thermal treatments are used to mitigate oxidation, but their in vivo efficacy is under investigation.

Purpose of the Study:

  • To analyze oxidation, oxidation potential, and mechanical behavior of retrieved, thermally treated HXLPE acetabular liners.
  • To assess the long-term effects of clinical implantation on HXLPE materials.

Main Methods:

  • Analysis of 307 retrieved acetabular liners from revision surgeries over 10 years.
  • Categorization of liners by sterilization and treatment: nonionizing, inert environment, annealed HXLPE, and remelted HXLPE.
  • Assessment of oxidation and oxidation potential using Fourier transmission infrared spectroscopy.
  • Evaluation of mechanical behavior via the small punch test.

Main Results:

  • Elevated oxidation and oxidation potential were observed in annealed and inert environment sterilized liners, especially at the rim.
  • Increased oxidation over time was noted at the bearing surface of remelted liners.
  • Ultimate strength at the bearing surface negatively correlated with implantation time for annealed liners.

Conclusions:

  • First-generation HXLPE shows a promising clinical outlook within the first decade.
  • Continued research is needed to monitor oxidation in annealed liners and understand in vivo changes in remelted liners.
  • Long-term surveillance is essential for assessing the clinical implications of observed oxidative degradation in HXLPE bearings.