I know there is a lot of interest in bindings for protection of these injuries (Knee Bindings being one of the most recent). Before looking at the binding what is the cause and could it be the ski (ski shape in particular).
One of the things that I have noticed is that since stepping from straight skis to shaped skis this year (2012), there does seem to be additional loading placed on the knees. Upon review of some of the old videos and new videos (with injuries) this does appear to also hold true. It appears the shaped ski allow for more forces to applied to the snow vs the old straight skis of yester year.
This leads to the question, do shaped skis (while making the turns easier for the skier) actual increase the risk of injury to the knees as a direct result?
This questions is not intended to ask which binding is the best, but more so to possible help identify if shape skis might be part of the problem (BTW now that I have a set, you'll have to pry them from my cold dead fingers). If this is the case it might be possible to help correct part of the issue if it is. Solution I don't know, at this point I leave that to wiser minds.
Please have at it and provide your best opinions as I am doing this only for curiosity sake. For sake of making it easier Park skiing is not included (as I suspect that no matter the ski, you are going to run the same risk for injury).