Abstract
AbstractModularity of total hip prosthesis (THP) involves a taper junction between the femoral stem trunnion and the inner taper of the femoral head. This introduces another contact interface that can lead to the generation of wear particles, and may cause THP failure. In this work, we aimed to study the effect of roughness on the fixation of the surfaces conected. We analyzed whether a micro-grooved finish of the taper surface of the femoral stem trunnion improves fixation and reduces the wear rate. The effect of CoCrMo femoral head fixation was investigated with a smooth tapered surface combined with a micro-grooved finish of the Ti6AlV trunnion, and a smooth one of the tapered finishes of the trunnion surface. A computerized finite elements model of the wear was used to compare the wear evolution between models. The main conclusion was that the surfaces of the taper and of the smooth trunnions will ensure a better fixation to the taper junction and will reduce the volumetric wear.KeywordsTotal hip prosthesesTaper junctionWear modelling
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