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Related Experiment Videos

Observations on retrieved glenoid components.

Ralph Hertel1, F T Ballmer

  • 1Department of Orthopaedic Surgery, Inselspital, University of Berne, 3010 Berne, Switzerland.

The Journal of Arthroplasty
|May 3, 2003
PubMed
Summary
This summary is machine-generated.

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Analysis of retrieved prosthetic glenoid components revealed significant damage patterns, including fractures in highly crystalline polyethylene (Hylamer) implants. These findings highlight potential issues with implant design and wear in shoulder arthroplasty.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Biomedical Engineering

Background:

  • Prosthetic glenoid components are crucial in shoulder arthroplasty.
  • Understanding wear patterns and failure modes is essential for improving implant longevity.
  • Highly crystalline polyethylene (Hylamer) has been used in some glenoid designs.

Purpose of the Study:

  • To investigate the patterns of damage in retrieved prosthetic glenoid components.
  • To identify common wear mechanisms and their potential causes.
  • To evaluate the implications of component design on glenoid loosening.

Main Methods:

  • Analysis of 7 retrieved glenoid components (2 standard polyethylene, 5 Hylamer).
  • Components were retrieved 3 to 12 years after implantation.

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  • Examination of wear patterns, including deformation, crumbling, and roughening.

    • Main Results:

    • Four out of five Hylamer components fractured at revision.
    • Common wear patterns included rim deformation/crumbling, surface roughening, and posterior wear.
    • Excessive glenoid coverage may lead to humeral abutment and shear forces.

    Conclusions:

    • Retrieved Hylamer glenoid components showed a high rate of fracture.
    • Observed wear patterns suggest mechanical impingement and shear forces contribute to component failure.
    • Component design, particularly coverage of the humeral head, may influence glenoid loosening.