[1] Tampere Univ Hosp, Dept Surg, FIN-33521 Tampere, Finland
[2] Urho Kaleva Kekkonen Inst, Accid & Trauma Res Ctr, FIN-33501 Tampere, Finland
[3] Urho Kaleva Kekkonen Inst, Tampere Res Ctr Sports Med, FIN-33501 Tampere, Finland
[4] Univ British Columbia, Dept Family Practice Sports Med, Vancouver, BC V6T 1Z1, Canada
[5] Univ British Columbia, Sch Human Kinet, Vancouver, BC V6T 1Z1, Canada
[6] Natl Inst Traumatol, Dept Morphol, H-1430 Budapest, Hungary