Outside Online reports:
ACL injuries rank as the number one ski injury, representing 17.2 percent of all injuries in the sport, according to a 2012 study published in the American Journal of Sports Medicine. More than 20,000 U.S. alpine skiers damage their knees every year, and most of those injuries involve the ACL.
The ACL itself is one of four main ligaments in the knee, and its main
role is to stabilize the knee during rotational movement. Rotating a
knee too far to one side or the other, or hyper extending it, can tear
or even rupture the ACL. Recovery time ranges from six weeks for a
moderate sprain to six months or more for a rupture, which typically
requires surgery to repair. One study
showed that athletes suffer an ACL tear are seven times more likely to
develop osteoarthritis in that knee than athletes who have not injured
their ACL.
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