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3. National Joint Registry. Patient characteristics for primary hip replacement procedures. Available from: URL: http://www.njrreports.org.uk/hips-primary-procedures-patient-characteristics/H04v9NJR?reportid=E3ACD4F8-60DB-4B08-9052-BEBBE4440494&defaults=DC__Reporting_Period__Date_Range=%222018%7CNJR2017%22,J__Filter__Calendar_Year=%22MAX%22,H__Filter__Joint=%22Hip%22
4. National Joint Registry. Patient characteristics for knee arthroplasty 2017. Available from: URL: http://www.njrreports.org.uk/knees-primary-procedures-patient-characteristics/K06v9NJR?reportid=E3ACD4F8-60DB-4B08-9052-BEBBE4440494&defaults=DC__Reporting_Period__Date_Range=%222017%7CNJR2016%22,J__Filter__Calendar_Year=%22MAX%22,H__Filter__Joint=%22Knee%22
5. National Joint Registry. Patient characteristics for primary knee arthroplasty 2018. Available from: URL: http://www.njrreports.org.uk/knees-primary-procedures-patient-characteristics/K06v9NJR?reportid=E3ACD4F8-60DB-4B08-9052-BEBBE4440494&defaults=DC__Reporting_Period__Date_Range=%222018%7CNJR2017%22,J__Filter__Calendar_Year=%22MAX%22,H__Filter__Joint=%22Knee%22