1. Department of Trauma and Orthopaedic Surgery, University College London Hospital, London, UK
2. Department of Orthopaedic Surgery, The Princess Grace Hospital, London, UK
3. University College London Hospitals NHS Foundation Trust, London, UK
4. The Bone & Joint Journal , London, UK
5. University College London Hospitals, The Princess Grace Hospital, and The NIHR Biomedical Research Centre at UCLH, London, UK