Topographical analysis of the femoral components of ex vivo total knee replacements
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With greater numbers of primary knee replacements now performed in younger patients there is a demand for improved performance. Surface roughness of the femoral component has been proposed as a causative mechanism for premature prosthesis failure. Nineteen retrieved total knee replacements were analysed using a non-contacting profilometer to measure the femoral component surface roughness. The Hood technique was used to analyse the wear and surface damage of the matching ultra-high molecular weight polyethylene (UHMWPE) tibial components. All femoral components were shown to be up to 11× rougher after their time in vivo while 95 % showed a change in skewness, further indicating wear. This increase in roughness occurred relatively soon after implantation (within 1 year) and remained unchanged thereafter. Mostly, this roughness was more apparent on the lateral condyle than the medial. This increased femoral surface roughness likely led to damage of the UHMWPE tibial component and increased Hood scores.
- 1.National Joint Registry for England and Wales. 8th Annual Report. 2011.Google Scholar
- 8.Que L, Topoleski LDT, Parks NL. Surface roughness of retrieved CoCrMo alloy femoral components from PCA artificial total knee joints. J Biomed Mater Res. 2000;53(1):111–8. doi:10.1002/(sici)1097-4636(2000)53:1<111:aid-jbm15>3.0.co;2-y.CrossRefGoogle Scholar
- 10.Cho CH, Murakami T, Sawae Y. Influence of microscopic surface asperities on the wear of ultra-high molecular weight polyethylene in a knee prosthesis. Proc Inst Mech Eng Part H J Eng Med. 2010;224H(4):515–29 doi:10.1243/09544119jeim690.
- 15.Kurtz SM. The UHMWPE biomaterials handbook: ultra-high molecular weight polyethylene in total joint replacement and medical devices, vol. 2. Burlington: Academy Press; 2009.Google Scholar