QIST Collaborative - Arthroplasty Research Cohort (ARC) Study

The ARC Study is a national observational cohort study to investigate patient reported and clinical outcomes after hip and knee replacements. The study has the following objectives: 1. To evaluate outcomes following hip and knee replacements. 2. To determine risk factors for adverse outcomes in primary hip and knee replacements. 3. To identify targets for future research and intervention in patients undergoing primary hip and knee replacements 4. To provide a resource from which to identify potential participants for future clinical trials, and to use data collected in the ARC Study as comparison or control data for trial participants who have been randomised to receive one or more interventions. Participants are recruited and consented online. Patients are invited to participate by collaborating surgical teams nationally in outpatient clinics at the time of being added to a waiting li