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The patellar meniscus in total knee replacement.

H U Cameron1, G M Cameron

  • 1University of Toronto, Canada.

Orthopaedic Review
|March 1, 1987
PubMed
Summary
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Patellar replacements, often polyethylene, are expected to wear significantly due to high loads. However, this study found minimal wear, suggesting patellar geometry may not be critical for wear in knee revisions.

Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Wear mechanics

Background:

  • Patellar replacements are typically convex polyethylene components designed for high-load bearing in knee arthroplasty.
  • Theoretical models predict substantial wear for these components due to the mechanical stresses involved.
  • Clinical observations of wear in patellar components have been less frequent than anticipated.

Purpose of the Study:

  • To investigate the incidence and characteristics of wear in patellar components during knee revision surgery.
  • To determine if patellar articular surface geometry influences wear patterns.
  • To correlate wear with clinical outcomes such as dislocation.

Main Methods:

  • A retrospective review of knee revision surgeries was conducted.

Related Experiment Videos

  • Data from 12 cases with patellar resurfacing were analyzed.
  • Examination of revised patellar components for evidence of wear and associated tissue formation.

    • Main Results:

    • Patellar components were revised in five out of 12 cases.
    • Gross wear was observed in three cases, all associated with patellar dislocation.
    • A dense fibrous tissue meniscus surrounded the patella in all cases, with small wear facets noted in exposed areas.

    Conclusions:

    • Significant wear in patellar replacements appears less common than theoretically predicted.
    • Patellar dislocation may be a contributing factor to observed wear.
    • The geometry of the patellar articular surface might not be the primary determinant of wear in these components.