It's probably hard to find any stats on this.
My opinion(which may or may not be true) is they are more common these days than they were 10 years ago. I would base this on a few things:
- As ski technology and materials have improved, more people are riding shorter skis with larger sidecuts. This makes it easier to turn, but it also makes it easier for the inexperienced to have a false sense of security and control. The result is some end up being comfortable with higher speeds much quicker than they are comfortable making balanced and efficient turns. They lack the skills to really make a clean and balanced turn and this can punish you at high speeds.
- Bindings and boots have too much delta/ramp angles, and boots have too much forward lean. This puts the skier with their butt and hips hanging out towards the back, and to compensate many will ride the cuffs to stay balanced. When crossing tips, this puts the skier at risk of jamming the inside or outside leg in a position where forces are not correctly transmitted to the binding toe piece. It also puts the skier in a position where a recovery is difficult if an edge gets jammed while in an akward position. The end result of this can easily be the shin of the jammed leg taking the full brunt of the forward movement of the body as it jams up against the boot cuff - snap, crackle, and pop. If one is in balance fore and aft it is much easier to compensate for such a scenario - if the shin is already leaning against the cuff with a lot of force, it will be impossible to react and get the weight back in enough time to avoid catastrophe.
I would offer the following advice:
- Obviously, stay out of terrain that is over your head.
- Keep the hot dogging to a minimum. Slow down a bit now and then. Skiing is about more than speed. People will be more impressed with someone who skis in command at a moderate pace than than someone who is simply bombing black runs at Mach II.
- Do not ride the ski tips or trails. Stay centered, do not constantly ride the cuffs. If you cannot stay centered without expending a lot of energy and leaning on the cuffs, something is wrong. I would suggest a visit to a good boot fitter.
- Contrary to some advice here, do not mess with the DIN on your bindings unless you have a valid reason too. If you bindings have been set and inspected properly for your stats, and if you stay centered and ski efficiently, they will not come off. Skiing 'faster' than normal is not a valid reason for jacking up the bindings. For most skiers/non racers, skiing faster actually puts less stress on your bindings than skiing slow. A binding is more likely to 'pre-release' at low speeds while pushing the tails around than they are at a high speed riding a nice balanced turn.
- Don't worry about it. If your skis and boots are properly alinged and you dont take unneccesary risks, I would say you shouldn't be too worried about it. If one is too preoccupied with getting hurt then they will ski defensively and will never advance. In short, they won't have any fun.