Previous major knee injuries among the participants in the FIS Freestyle World Championship 2001 in Whistler/Blackomb, Canada were recorded. Ninety-five skiers answered the questionnaire (response rate: 63%). Forty-seven percent of the skiers reported mean 1.6 previous serious knee injuries (range 1–5), female skiers with a significant higher prevalence than males. Thirty percent of the women and 24% of the men (p = 0.49) had suffered 1–3 ruptures of the anterior cruciate ligament (ACL) of the knee. There was no significant difference between the disciplines (mogul and aerial skiing) in the prevalence of any type of knee injury.
In conclusion, nearly half of the responding FIS freestyle World Championship skiers had previously sustained one or more major knee injuries and still returned to such a high level of athletic performance. One fourth of the skiers had sustained one or more former ACL ruptures. The prevalence of previous serious knee injuries over all was significantly higher among female than among male skiers.