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Related Experiment Videos

Motion at the modular acetabular shell and liner interface. A comparative study.

T K Fehring1, S E Smith, E R Braun

  • 1Charlotte Orthopedic Specialists, PA, 28207, USA.

Clinical Orthopaedics and Related Research
|November 5, 1999
PubMed
Summary

Micromotion at the shell-liner interface in total hip arthroplasty components generates polyethylene debris, potentially causing osteolysis. Limiting this motion may reduce wear and extend implant longevity.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Mechanical Engineering

Background:

  • Total hip arthroplasty (THA) polyethylene wear is a significant cause of osteolysis and revision surgery.
  • While concave articulation wear is well-studied, abrasive wear at the convex side of modular components is also implicated.
  • Motion between the polyethylene liner and its shell can cause abrasive wear, contributing to debris generation.

Purpose of the Study:

  • To quantify micromotion at the shell-liner interface of modular acetabular components.
  • To assess the variability of this motion across different manufacturers.
  • To evaluate the potential impact of micromotion on polyethylene debris generation.

Main Methods:

  • Six modular acetabular component samples from eight manufacturers were tested.

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  • Fiberoptic sensors were used to detect micromotion in the x, y, and z planes at the shell-liner interface.
  • Micromotion was measured to determine its magnitude and variation.

    • Main Results:

    • Micromotion was detected at the shell-liner interface in all tested designs.
    • The magnitude of motion varied significantly between manufacturers, ranging from 5 to 311 microns.
    • These findings indicate a potential source of polyethylene debris not solely from the primary articulation.

    Conclusions:

    • Micromotion at the shell-liner interface is a common phenomenon in modular acetabular components.
    • Design features that minimize or eliminate this interface motion could be crucial for reducing polyethylene debris.
    • Reducing debris generation through improved design may enhance the long-term success of total hip arthroplasty.