This single-centre parallel-design trial was conducted between March 2012 and March 2014 at the Nuffield Orthopaedic Centre, Oxford. Four expert knee surgeons performed all of the procedures in this study. Patients who were being placed on the waiting list for a medial Unicompartmental Knee Replacement, and met the entry criteria for the trial, were asked to see if they would be willing to receive further information about participation in the study. They were provided with a study information leaflet that they could read in their own time. A member of the research team subsequently contacted the patients in order to determine if they would agree to take part in the study and enrolled them onto the study.