In Scandinavia, there have been several studies on how proper warm-up and strength training can reduce knee injuries for female teenage athletes (especially soccer players).
A smaller norwegian study:
http://www.klokeavskade.no/en/News-a...y-risk-by-50-/
A larger swedish study (cant find a english version so you have to use google translate):
http://sverigesradio.se/sida/gruppsi...rtikel=4305758