Data relating to "The Influence of Malalignment and Ageing Following Sterilisation by Gamma Irradiation in an Inert Atmosphere on the Wear of UHMWPE in Patella-Femoral Replacements". The dataset contains: - Images of the wear scars on the patellae following wear simulation, the pdf gives an overview of the images, the high resolution photographs have also been provided - Analysis of the area of the wear scars following wear simulation - Analysis of the post-test surface roughness of the patellae following wear simulaiton All data has been converted to text files. The start of each text file includes a brief explanation of the dataset and a cross reference with the table/figure to which the dataset belongs.