Read me file associated with data set associated with 'Influence of contact pressure, cross-shear and counterface material on the wear of PEEK and CFR-PEEK for orthopaedic applications' Two datasets are available associated with the paper weardata.xls and roughnessdata.xls The weardata.xls contains three tabs associated with the contact pressure, cross-shear and counterface studies. Each tab includes the mean wear factor and the calculated 95% confidence limits for each test condition. This data was used to plot figures 2-4 within the paper. All tabs include a brief description of test conditions, which are documented in more detail in the paper. The roughnessdata.xls file contains surface roughness (Ra) data for the CoCr and polymer plates from the cross-shear and counterface studies. Each tab briefly details the methods used (further detail within the paper) For each plate, 5 measurements were taken, and the data presented within this file is the mean of those five traces for each sample.