[1] Section of Sports Medicine,
[2] Department of Orthopedic Surgery,undefined
[3] Gentofte Hospital,undefined
[4] University of Copenhagen,undefined
[5] DK-2900 Hellerup,undefined
[6] Denmark Tel.: +45-39-77 35 98 Fax: +45-39-65 49 16,undefined
[7] Sundby Hospital,undefined
[8] University of Copenhagen DK-2900 Hellerup,undefined
[9] Denmark,undefined