Wear products produced by metal implants can be divided into metal wear particles, eluted metal and corrosion-induced chemical compounds. These wear products are absorbed by a living body and since excretion behavior is different, the toxicity of absorbed wear products differs depending on their state. Accordingly, the elution behavior of metal implants contributes significantly to their biocompatibility. Therefore, the shape of particles of wear products of different metals formed in the quasi-body fluid environment and amounts of chemical constituent elements of corrosion-induced products and eluted metals have been quantified by the ICP method. Co-28Cr-6Mo shows the formation of metal wear particles less than other metals and offers a good wear-resistant property. The proportions of metal wear particles and corrosion-induced chemical compounds are 66 and 34, which indicates a high proportion of chemical compounds produced. Among wear products resulting when SUS316L steel is used, metal wear particles occupy 96. The same tendency is observed in the case of using Ti-6Al-4V alloy. The grit size of metal wear particles in the case of Ti-6Al-4V alloy is very small, but elution proceeds rather intensively.
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