Doctors are recording huge increases in pre-teens needing surgery for ACL injuries.
After one clinic in Philadelphia said rates are up 400 percent in the last 10 years, surgeons all over the country have been chiming in, saying the same, and a study shows a 148-percent increase in Australian teens with ACL injuries over the same time period.
Injuries to the ACL (anterior cruciate ligament), which connects the knee bones and provides stability, are common among professional athletes and marathon runners, who spend nearly all their time practicing the same sport, putting the same, repetitive strain on their bodies.
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