Higher rate of revision in PFC sigma primary total knee arthroplasty with mismatch of femoro-tibial component sizes

Simon W. Young, Henry D. Clarke, Stephen E. Graves, Yen Liang Liu, Richard N. de Steiger

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Total knee arthroplasty (TKA) systems permit a degree of femoro-tibial component size mismatch. The effect of mismatched components on revision rates has not been evaluated in a large study. We reviewed 21,906 fixed-bearing PFC Sigma primary TKAs using the Australian Orthopaedic Association National Joint Replacement Registry, dividing patients into three groups: no femoro-tibial size mismatch, tibial component size. >. femoral component size, and femoral component. >. tibial component. Revision rates were higher when the femoral size was greater than the tibia, compared to both equal size (HR. =. 1.20 (1.00, 1.45), P=. 0.047) and to tibial size greater than femoral (HR. =. 1.60 (1.08, 2.37), P=. 0.019). Potential mechanisms to explain these findings include edge loading of polyethylene and increased tibial component stresses.

Original languageEnglish (US)
Pages (from-to)813-817
Number of pages5
JournalJournal of Arthroplasty
Volume30
Issue number5
DOIs
StatePublished - May 1 2015

Keywords

  • Component size
  • Registry
  • Revision rates
  • Size mismatch
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Medicine(all)
  • Orthopedics and Sports Medicine

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