[1] Univ Med Ctr Regensburg, Dept Trauma Surg, Franz Josef Str Allee 11, D-93042 Regensburg, Germany
[2] Sporthopaedicum Regensburg, Hildegard von Bingen Str 1, D-93053 Regensburg, Germany
[3] Freiburg Univ Hosp, Dept Orthoped Surg & Traumatol, Hugstetter Str 55, D-79106 Freiburg, Germany
[4] Hirslandenklin, SportClin Zurich, Witellikerstr 40, CH-8032 Zurich, Switzerland
[5] Rizzoli Orthopaed Inst, Orthopaed & Traumatol Clin 2, Biomech Lab, Via Di Barbiano 1-10, I-40136 Bologna, Italy
[6] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Orthoped Surg, Boston, MA 02115 USA
[7] Univ Saarland, Ctr Expt Orthopaed, Homburg, Germany
[8] Univ Saarland, Med Ctr, Dept Orthopaed Surg, Kirrberger Str 100,Bldg 37-38, D-66421 Homburg, Germany