Mean bulk lubricant temperature (°C) of a cobalt chrome-on-UHMWPE knee implant and a PEEK-OPTIMA™-on-UHMWPE knee implant (n=3)during wear simulation under both Leeds intermediate and Leeds high kinematics. The simulator was run under room temperature conditions and the temperature of the bulk lubricant was assessed daily using a calibrated thermocouple close to the articulating surfaces. Data is presented in the results section of the manuscript Intermediate kinematics High kinematics SAMPLE cobalt chrome PEEK-OPTIMA™ cobalt chrome PEEK-OPTIMA™ 1 27.9 29.5 27.5 29.8 2 28.3 29.5 27.7 29.8 3 27.8 29.6 27.5 29.4