1 Institute for Biomechanics, Berufsgenossenschaftliche Unfallklinik Murnau, Germany & Paracelsus Medical University Salzburg, Austria. Electronic address: peter.augat@bgu-murnau.de.
2 Department of Trauma and Orthopaedics, University of Edinburgh, Royal Infirmary of Edinburgh, 51 Little France Crescent, Old Dalkeith Road, Edinburgh, EH16 4SA, UK.