[1] Southport & Ormskirk Hosp NHS Trust, Dept Trauma & Orthopaed, Southport, England
[2] Southport & Ormskirk NHS Trust, Dept Rheumatol, Southport, England
[3] VMMC & Safdarjung Hosp, Dept Pulm Crit Care & Sleep Med, New Delhi, India
[4] Royal Orthopaed Hosp, Dept Musculoskeletal Radiol, Birmingham, W Midlands, England
[5] Stepping Hill Hosp, Dept Anaesthesiol, Stockport, Lancs, England
[6] Dr Ram Manohar Lohia Hosp, Atal Bihari Vajpayee Inst Med Sci, Dept Orthopaed, New Delhi, India