1King's College Hospital NHS Foundation Trust, King's Foot and Ankle Unit, London, United Kingdom
2Avon Orthopaedic Centre, Bristol, United Kingdom
3Mid Yorkshire Hospitals NHS Trust, Wakefield, United Kingdom
4Leeds General Infirmary, Leeds, United Kingdom
5University of Bristol, National Institute for Health Research Bristol, Bristol, United Kingdom
6Orthopaedic and Arthritis Specialist Centre, Sydney, Australia
7Orthopaedics SA, Ashford, Australia