Data associated with the paper "Wear and Friction of UHMWPE-on-PEEK-OPTIMA". This dataset contains: - The wear factors for the UHMWPE pins after 1MC wear simulation against PEEK and cobalt chrome plates tested in 0, 2, 5, 25 and 90% serum concentrations under room and elevated temperature conditions - The surface roughness of the PEEK and cobalt chrome plates after 1MC wear simulation under the conditions detailed above - The bulk lubricant temperature of all the tests detailed above - The coefficient of friciton of UHMWPE-on-PEEK under 0, 2, 5, 25 and 90% serum concentrations at room temperature - Additional images of the plates post-test