1 Department of Orthopaedic Surgery, UPMC Freddie Fu Sports Medicine Center, University of Pittsburgh, 3200 S. Water St., Pittsburgh, PA, 15203, USA.
2 Department for Orthopaedic Sports Medicine, Klinikum Rechts Der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany.
3 Department for Orthopaedics, Sahlgrenska University Hospital, Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden.
4 Department of Orthopedic Surgery, Fowler Kennedy Sport Medicine Clinic, University of Western Ontario, 3M Centre, 1151 Richmond Street, London, ON, N6A 3K7, Canada.
5 Department of Orthopaedic Surgery, UPMC Freddie Fu Sports Medicine Center, University of Pittsburgh, 3200 S. Water St., Pittsburgh, PA, 15203, USA. musahlv@upmc.edu.