[1] Med Univ Vienna, Dept Orthoped & Trauma Surg, Div Orthoped, A-1090 Vienna, Austria
[2] Univ Med Ctr Regensburg, Dept Trauma Surg, D-93053 Regensburg, Germany
[3] Asklepios Klinikum Bad Abbach, Univ Med Ctr Regensburg, Dept Orthoped, D-93077 Bad Abbach, Germany