1. Department of Radiology, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK
2. Department of Orthopaedic Surgery, Addenbrooke's Hospital, Cambridge, UK
3. Department of Radiology, King's College Hospital NHS Foundation Trust, London, UK
4. Department of Radiology, Chapel Allerton Hospital, Leeds, UK
5. Department of Orthopaedic Surgery, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK