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Reduced UHMWPE Wear Using Magnesia-Stabilized Zirconia Instead of CoCr Femoral Components in a Knee Simulator

The Journal of Arthroplasty
DOI: 10.1016/j.arth.2014.09.027
  • Total Knee Arthroplasty
  • Wear
  • Cobalt Chromium
  • Ceramic
  • Roughness


Abstract Magnesia-stabilized zirconia (Mg-PSZ) is stable and maintains a scratch-resistant surface in hip replacement, but is untested in knees. We assessed whether using Mg-PSZ instead of cobalt-chromium (CoCr) femoral components resulted in less tibial insert wear, and evaluated changes in topography and roughness of the femoral components. Inserts bearing against CoCr or Mg-PSZ were tested using standard (9Mc) and aggressive (6Mc) waveforms. Femoral component surface topography and roughness were evaluated before and after testing by optical profilometry. When bearing against Mg-PSZ, UHMWPE wear rate decreased by 73% (standard) and by 59% (aggressive conditions). After 15Mc, CoCr components featured deep scratches, and roughness increased five-fold, while Mg-PSZ components were unchanged. Mg-PSZ femoral components may be indicated for high-demand patients and those with metal sensitivity.

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