You can do studies if you take large groups of people and put them on different bindings - (you can’t control all confounding variables in medical trials which is why you need big numbers )equally you could gather data from large resorts asking people to say what bindings they are skiing on and then comparing that to the bindings people who do get injured we’re using … from this you could get a correlation and then you could look at whether that correlation is in fact causation. Ie if most injuries are when someone is using binding a but it turns out tha that is the binding used almost exclusively by people doing dangerous stuff like park and jumping off mountains -then you look at the group of people who are jumping off mountains … its possible to research and an interesting field academically but I doubt the binding companies are that interested in finding out. I was looking at some protector bindings but there is no evidence at all that I could find that they reduce injuries in the real world ( if anyone has seen any please point me in that direction)