1. Joint Reconstruction Unit, Royal National Orthopaedic Hospital, Royal National Orthopaedic Hospital NHS Trust, Stanmore, UK
2. Department of Trauma and Orthopaedics, Kingston Hospital, Kingston Hospital NHS Foundation Trust, Kingston, UK
3. Department of Radiology, John Radcliffe Hospital, Oxford, UK
4. Nuffield Department of Orthopaedics and Rheumatology (NDORMS), University of Oxford, Oxford, UK