Development of a New Patient Reported Outcome Measure (PROM) to Assess Patient's Emotional Wellbeing, and Perceptions of Total Knee Replacement Surgery for the Treatment of Knee Arthritis

Inclusion Criteria: * Patients aged 18 years of age or older. * Patients who have undergone Total Knee Replacement surgery with a metal implant for the treatment of end-stage knee arthritis in the last 3 months. * Patients who have only undergone one Total Knee Replacement surgery on the index knee. * Patients who, in the opinion of the Investigator, are able to understand this project and co-operate with the requirements of participation. * Patients who are able to give voluntary, written informed consent to participate in this project and from whom consent has been obtained. Exclusion Criteria: * Patients, who in the opinion of the Investigator, exhibit evidence of any condition or co-morbidity that would compromise their participation in the project. * Patients who are unable to understand and communicate fluently in English. * Patients who have experienced a complication following Total Knee Replacement surgery requiring a further hospital admission or revision surgery to the index knee.