Does a micro-grooved trunnion stem surface finish improve fixation and reduce fretting wear at the taper junction of total hip replacements? A finite element evaluation

摘要: The generation of particulate debris at the taper junction total hip replacements (THRs), can cause failure artificial hip. surfaces femoral heads and trunnions stems are generally machined to a certain roughness enhance fixation. However, effect surface these on fixation, wear consequently clinical outcomes design is largely unknown. In this study, we asked whether micro-grooved trunnion finish (1) improves fixation (2) reduces rate THRs. We used 3D finite element (FE) models THRs to, firstly, investigate initial Cobalt-Chromium head with smooth mated Titanium smooth, finishes. Secondly, computational FE model compare evolution between models, which was then validated against measurements explanted heads. found be better for couplings. Over 7 million load cycle analysis in-silico, linear depth material loss around 3.2 1.4 times higher trunnions. It therefore concluded that will provide reduce volumetric rates.