[1] Martin Luther Hosp, Dept Orthopaed & Trauma Surg, D-14193 Berlin, Germany
[2] Asklepios Harzkliniken GmbH, Bad Harzburg, Germany
[3] Cross Klin Basel, Olympic Med Ctr, Basel, Switzerland
[4] Arcus Sportklin, Pforzheim, Germany
[5] Deutsch Sporthsch, Inst Biomech, Cologne, Germany
[6] Sportorthopad Klin Tubingen, Tubingen, Germany