1. Department of Orthopaedic Surgery, CHRU La Cavale Blanche, Brest Hospital, Boulevard Tanguy Prigent, 29200 Brest, France
2. Faculty of Medecine Brest, University of Western Brittany, 22 Rue Camille-Desmoulins, 29200 Brest, France
3. Orthopaedic Unit, Clinic of Ter, Chemin de Kerbernès, 56270 Lorient, France
4. Orthopaedic Unit, Clinic Saint Michel and Sainte Anne, 88 Rue de Kergéstin, 29000 Quimper, France