Philippe Hernigou1, Andreas F Mavrogenis2, Marius M Scarlat3. 1. Henri Mondor Hospital, University Paris, Créteil, France. 2. First Department of Orthopaedics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. 3. Clinique Chirurgicale St. Michel, Groupe ELSAN, Toulon, France. mscarlat@gmail.com.