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Retrieval analysis of contemporary antioxidant polyethylene: multiple material and design changes may decrease

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Summary
This summary is machine-generated.

The Attune Knee System

Keywords:
PolyethylenePolyethylene linear deformationPolyethylene surface damageRetrieval analysisTotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Medical device analysis

Background:

  • The Attune Knee System, introduced in March 2013, utilizes a novel antioxidant-infused polyethylene formulation.
  • Previous in vitro studies suggest antioxidants enhance Ultra-High Molecular Weight Polyethylene (UHMWPE) performance.
  • No prior retrieval studies have assessed the in vivo polyethylene damage of the Attune Knee System.

Purpose of the Study:

  • To evaluate the in vivo performance of the Attune Knee System.
  • To compare polyethylene damage in Attune implants with their predecessors (PFC Knee System).
  • To identify potential differences in implant performance based on retrieval analysis.

Main Methods:

  • Retrieved 24 PFC (18 fixed, 6 rotating) and 17 Attune (8 fixed, 9 rotating) knee implants.
  • Macroscopic analysis of polyethylene components using a standardized damage grading method.
  • Micro-CT based measurement of medio-lateral polyethylene thickness and metal component roughness.

Main Results:

  • Attune fixed bearing tibial inserts exhibited significantly higher backside surface damage scores compared to PFC counterparts (p=0.01).
  • No other significant differences were observed in polyethylene damage across other surfaces.
  • No significant differences were found in metal component surface roughness or medio-lateral linear deformations.

Conclusions:

  • A notable difference in backside surface damage exists between Attune and PFC fixed bearing designs.
  • Material and design modifications in the Attune system may influence in vivo implant performance.
  • Findings provide insights into the clinical performance of the Attune Knee System, impacting a large patient population.