The Effects of Patellar Thickness on Patellofemoral Forces after Resurfacing

Michael J. Star, Kenton R. Kaufman, Steven E. Irby, Clifford W. Colwell

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


The purpose of this study was to determine the effect of patellar bone and patellar implant thickness on patellofemoral forces after resurfacing in total knee arthroplasty. Seven cadaver knees were tested using an Oxford Knee Testing Rig. This model gave the specimens 6° freedom while dynamic data were collected. Each knee was tested from full extension to 95° knee flexion. Knees were implanted with Press Fit Condylar femoral, tibial, and patellar implants. The effect of varying patellar thickness on patellofemoral forces was determined by using custom modular oval-domed polyethylene patellar components with progressive thickness increments of 2 mm. Patellofemoral forces were measured by a custom-designed uniaxial patellar load cell. Statistically significant increases in patellofemoral compression forces were found from 70° to 95° flexion with increased patellar bone and patellar implant thickness.

Original languageEnglish (US)
Pages (from-to)279-284
Number of pages6
JournalClinical orthopaedics and related research
Issue number322
StatePublished - Jan 1996

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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