Post-operatively, the need to have a blood transfusion, and the change haemoglobin levels were also recorded. Oxygen saturation levels over the first 24 hours post surgery were also recorded. Screened anteroposterior and lateral post-operative radiographs were performed prior to discharge. Patients attended the physiotherapy ward discharge clinic at six weeks. A further clinical review was performed at 12 months at which point Oxford Knee Scores were recorded.