Virendra Jain1, Daniel Lindsay2, Asif Saifuddin3. 1. Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, London, HA7 4LP, UK. drviren21may@gmail.com. 2. Department of Histopathology, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, London, HA7 4LP, UK. 3. Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, London, HA7 4LP, UK.