1. College of Medical and Dental Sciences, University of Birmingham , Birmingham, B15 2TT, United Kingdom
2. Department of Musculoskeletal Radiology, The Royal Orthopaedic Hospital NHS Foundation Trust, Birmingham, B31 2AP , United Kingdom
3. Department of Orthopaedics, Mersey and West Lancashire Teaching Hospitals NHS Trust, Southport, PR8 6PN , United Kingdom