A Nune1, K P Iyengar2, R Botchu3, Bhupen Barman4, C Manzo5. 1. Southport and Ormskirk Hospital NHS Trust, Southport, PR8 6PN, UK. arvind.nune@nhs.net. 2. Southport and Ormskirk Hospital NHS Trust, Southport, PR8 6PN, UK. 3. The Royal Orthopaedic Hospital NHS Trust, Birmingham, UK. 4. North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong, Meghalaya, India. 5. Azienda Sanitaria Locale Napoli 3 Sud, "Mariano Lauro" Hospital, Rheumatologic Outpatient Clinic, Sant'Agnello, Campania, Italy.