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Related Experiment Videos

Wear pattern of retrieved patellar implants.

O Schwartz1, J Aunallah, M Levitin

  • 1Forum for Excellence in Orthopaedic Surgery, Center for Implant Surgery Bnai Zion Medical Center, Technion Israel Institute of Technology, Haifa, Israel.

Acta Orthopaedica Belgica
|November 6, 2002
PubMed
Summary
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Polyethylene wear in knee replacements is common, with polishing and delamination being the most frequent damage modes. Improved patellar implant design, focusing on thickness and surface conformity, is crucial for reducing wear.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Mechanical Engineering

Background:

  • The
  • papillon
  • pattern of polyethylene wear is a significant concern in total knee arthroplasty (TKA).
  • Understanding wear mechanisms is critical for improving implant longevity and patient outcomes.

Purpose of the Study:

  • To analyze the patterns and modes of polyethylene wear in retrieved Kinematic and Total Condylar patellar components.
  • To compare contact stresses and wear areas between conforming (Kinematic) and nonconforming (Total Condylar) patellar designs.

Main Methods:

  • Retrieved patellar components (17 total: 5 Kinematic, 12 Total Condylar) were analyzed after an average of 80 months in situ.
  • Four modes of damage were assessed: polishing, delamination, cold flow, and scratching.

Related Experiment Videos

  • Contact stresses and wear areas were quantified and compared between the two implant designs.

    • Main Results:

    • Polishing (76.5%) and delamination (70.6%) were the predominant wear modes.
    • Conforming Kinematic components exhibited significantly lower contact stresses (2.9 kgf/mm²) compared to nonconforming Total Condylar components (12.9 kgf/mm²).
    • While wear area was smaller in Total Condylar implants, the difference was not statistically significant.

    Conclusions:

    • A fundamental design deficiency exists in current patellar implants, leading to a high incidence of wear.
    • Improving polyethylene implant thickness and ensuring conforming articulating surfaces are essential for reducing wear.
    • These design modifications are necessary to enhance the long-term performance of patellar components in TKA.