Fretting in prosthetic devices related to human body

Many bio-tribological problems are often associated with fretting. In fact, related to the human body, fretting may occur in prosthetic devices. General features can be obtained as follows: complex fretting modes, fretting loading condition, environment, and properties of the natural tissues. According to clinical applications, as two typical examples, fretting tests of the human skin and femur cortical bone have been carried out. Fundamental kinetics behaviors under different normal loads and displacement amplitudes were recorded. Fretting marks were examined after tests. Some new parameters such as using sensation to characterize bio-fretting have been proposed. In addition, challenges on the traditional definition on fretting with low oscillatory displacement have been discussed in the paper.