1Institution for Surgical Sciences, Section of Sports Medicine, Karolinska Institute, Stockholm, Sweden
2Department of Orthopaedics, Karolinska Hospital, Stockholm, Sweden
3Department of Mechanical Engineering, University of Delaware, 106 Spencer Lab, Newark, DE 19711, USA
4Department of Physical Therapy, University of Delaware, Newark, DE, USA
5Institution for Surgical Sciences, Section of Orthopaedics, Karolinska Institute, Stockholm, Sweden
6School of Human Kinetics, University of Ottawa, Ottawa, Canada
7Department of Mechanical Engineering, University of Ottawa, Ottawa, Canada