Andreas F Mavrogenis1, Andrew Quaile2, Marius M Scarlat3. 1. First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece. 2. Spineworks, Hampshire Clinic, Basingstoke, Hampshire, UK. 3. Clinique St. Michel, Groupe ELSAN, Toulon, France. mscarlat@gmail.com.