Preliminary experience of an international orthopaedic registry : the ESSKA Paediatric Anterior Cruciate Ligament Initiative (PAMI) registry - Mouton, Caroline (Luxembourg Institute of Research in Orthopaedics, Sports Medicine and Science) ; Moksnes, Håvard (Oslo Sports Trauma Research Centre) ; Janssen, Rob (Eindhoven University of Technology) ; Fink, Christian (Gelenkpunkt - Sports and Joint Surgery, Innsbruck) ; Zaffagnini, Stefano (IRCCS Istituto Ortopedico Rizzoli, Bologna) ; Monllau García, Joan Carles (Universitat Autònoma de Barcelona. Departament de Cirurgia) ; Ekås, Guri (Oslo Sports Trauma Research Centre) ; Engebretsen, Lars (Oslo University Hospital (Oslo, Noruega)) ; Seil, Romain (Luxembourg Institute of Research in Orthopaedics, Sports Medicine and Science)