(iv) Tribofilm on hip implants

Performance and longevity of artificial joints are highly correlated with the surface properties of the prosthesis materials. In view of the importance of this research area, this article consolidates the research work with some fundamental aspects to build up a comprehensive picture of the current state of knowledge. Tribofilm containing organometallic compounds can form on the surface of artificial joints through biotribocorrosion processes. Tribofilm can act as a barrier to prevent further ionic release and can also act as a solid lubricant. Some test methods are presented, being applied both in vivo and in vitro. A review of recent work in this area is provided, focussing on the constitution and microstructure of the artificial joints surface. The future perspective of this research area is summarized.