1 Department of Orthopaedics, NU Hospital Group, Trollhättan/Uddevalla, Sweden; Institute of Clinical Sciences, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
2 Department of Orthopaedics, NU Hospital Group, Trollhättan/Uddevalla, Sweden; Institute of Clinical Sciences, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Department of Research and Development, NU Hospital Group, Trollhättan, Sweden.