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Message: [QUOTE="Gupps01, post: 2672934, member: 8126"] Most ACL's are non-contact (~75%). So they go during change of direction movements or sometimes when you land from a jump and hyperextend it. Basically it comes down to the shearing forces from the change in direction experienced by the ligament are greater than it can handle. The mechanisms behind it are largely biomechanics. You see it a lot in touch footy because of the way they step, i.e. foot way outside of body and then exaggerated movement the other way. Massive shear stress on the ligament in this position due to the angle of the tibia in relation to the femur. As of yet we haven't found a way to directly increase the strength of the ligament through training so there's not much we can do from that perspective. Doing proprioception training can assist with decreasing likelihood of injury, but we're talking maybe 3-4% decrease in likelihood so not huge improvements and the improvements mostly come through improving the firing sequencing of the surrounding musculature. Most teams do this stuff in their warmup for strength sessions or as a discrete session on their own. I know with the athletes I've trained I do jumping and landing mechanics as well as some change in direction stuff. Workload has nothing really to do with it. If it was a hamstring or a calf then yes, these are often explained by workload (particularly the volume of high-speed running). For example I was talking to a former NRL S&C and they did a speed session of a bout 350m high speed running i.e 21km/hr+. A skills coach grabs a couple of the guys afterwards and gets them to do some extras for 30 or so minutes adding another 500m high speed running. The next day in the last 5 minutes of a tactical session one of the guys who did extras the day before pops a hamstring. All from doing 500m extra above 21km/hr. [/QUOTE]

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