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The normal patella--does it exist? A histologic analysis.

Aravind Athiviraham1, Joel Fechisin, Aaron Hartman

  • 1Baylor College of Medicine, Houston, TX. aravind.athiviraham@bcm.edu.

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This summary is machine-generated.

Even patellae that appear healthy during total knee arthroplasty (TKA) show microscopic cartilage degeneration. This finding suggests caution when considering selective patellar retention in TKA patients to avoid potential issues.

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Area of Science:

  • Orthopedic surgery
  • Histopathology
  • Biomaterials science

Background:

  • Selective patellar retention during total knee arthroplasty (TKA) is debated.
  • The condition of grossly normal-appearing patellae in TKA candidates requires further investigation.

Purpose of the Study:

  • To investigate the microscopic condition of apparently healthy patellae in patients undergoing TKA.
  • To test the hypothesis that these patellae exhibit significant articular cartilage degeneration.

Main Methods:

  • Ninety-six patients (110 knees) with primary degenerative osteoarthritis were analyzed.
  • Thirteen patellae with grossly normal cartilage were examined histologically.
  • Patellar cartilage thickness and markers of degeneration (fibrillation, fibrosis, etc.) were evaluated by a pathologist.

Main Results:

  • All examined patellae showed at least two histological markers of degeneration.
  • Mean cartilage thickness ranged from 2.31 mm to 2.62 mm across quadrants.
  • Even visually normal patellae exhibited microscopic signs of early to moderate articular degeneration.

Conclusions:

  • Grossly normal-appearing patellae in TKA candidates demonstrate significant microscopic articular cartilage degeneration.
  • Further research on cartilage thickness and area measurements is needed to determine the clinical impact on selective patellar retention during TKA.