In vivo roughening of retrieved total knee arthroplasty femoral components

Raphael Malikian, Kunalan Maruthainar, John Stammers, Steve R. Cannon, Richard Carrington, John A. Skinner, Nimalan Maruthainar, George Dowd, Tim W. R. Briggs, Gordon W. Blunn

Research output: Contribution to journalArticlepeer-review


Background - Joint registry data highlights the higher rates of cumulative revision for younger patients undergoing TKR. One of the reasons associated with this higher revision rate may be due to the wear of the UHMWPE leading to loosening. Alternate bearing surfaces have been developed to address this problem; however, roughening of the metal bearing surface has not been demonstrated in vivo.

Method - We recorded roughness measurements of retrieved femoral components.

Results - Average lateral condyle roughness was 0.032 μm, compared to control values of 0.020 μm, p=0.002; average medial condyle roughness was 0.028 μm, compared to a control value of 0.019, p<0.001.

Conclusion - There was a small but statistically significant roughening of femoral components in vivo compared to controls. This may have important implications for aseptic loosening of knee arthroplasty components and the decision to use scratch resistant components.

Original languageEnglish
Pages (from-to)278-282
Number of pages5
Issue number1
Early online date8 Nov 2012
Publication statusPublished - Jan 2014


  • Aged
  • Aged, 80 and over
  • Arthroplasty, Replacement, Knee
  • Case-Control Studies
  • Chromium
  • Cobalt
  • Device Removal
  • Female
  • Humans
  • Knee Prosthesis
  • Male
  • Microscopy, Electron, Scanning
  • Middle Aged
  • Polyethylene
  • Prosthesis Failure
  • Reoperation
  • Surface Properties


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