Inclusion Criteria:  Patients identified by a consultant orthopaedic surgeon as being on a waiting list for surgery on their knee. Patients identified by a consultant orthopaedic surgeon who are experiencing a delay to their knee surgery as a result of the COVID-19 pandemic. Patients over 18 years old.  Exclusion Criteria:  Patients who are no longer waiting for their surgery (e.g. surgery performed elsewhere or patient has changed their mind about undergoing surgery). Patients who are on a waiting list for any surgery other than surgery of the knee. Patients who are on a waiting list for surgery at a hospital which is not a part of Manchester University NHS Foundation Trust. Patients who cannot read and speak English. Patients who cannot complete the survey over the phone. Patients who cannot give informed consent due to cognitive impairment (e.g. dementia or similar cognitive condition).