1. Institute of Orthopaedics
2. Bone Tumour Unit
3. Orthopaedic Hospital Oncology Service, The Royal Orthopaedic Hospital, Bristol Road South, Northfield, Birmingham B31 2AP, UK.
4. Centre of Biomedical Engineering, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK