You cant 100% prevent ACL injuries some players are prone to them. For example Frimpong poped one then he poped the other, essien popped one then he poped the other, pires was the same i think. The prevention exercises are good but its very hard to say short term how effective our ACL prevention stratigies are when you're dealing with a sample size of 1 or 2. Two is very high but you usually get a spike in injuries when you change the playing surfaces so it could just be upgraded training pitches.
In general the new fitness concepts would suggest you need to prepare the players for loads more. Load doesnt break players but the load they're not prepaired for does. So when we gave ramsey 2 weesk rest one season and he ripped his hamstring the first game back 20 minutes in and wenger said its not our fault we gave him a rest. The newer ideas are that if a players needs to sprint a lot you need to get them sprinting during the week to make those tissues tough enough to absorb sprinting in games. So 2 weeks rest then sprinting would increase injury risk. What a lot of clubs do is limit sprinting in training to avoid injuries in training that will get the S&C coach fired but then the players are more succeptable to hamstring tears during the games. Managers accept injuries during the games but not in training so a lot of the prem teams still do this.
