I've just broken a bone in my left foot (I ride regular). So I rode fully geared up (knee, hips, tailbone, elbows, shoulders, gloves, wristguards and helmet) and was riding up a curb. Was doing the same curb a couple of times to get the feel of it. It went over it 3-4 times without much drama but the shock was quite violent, so I tried jumping at the same time the tire touched the curb to make everything go a bit smoother.
Wasn't going very fast, 8-10mph I think. What happened was when I did that little jump it seemed that the lack of pushing weight forward on the board got the tire stuck on the curb edge, so the board got stuck, I continued moving forward, my weight off the board but feet still in contact. The grip tape held on my foot making it turn on its side. When coming down my weight pushed on my tilted foot, and I presume in 99% of cases you would sprain your ankle, but I managed to get it right to that angle where the weight was pushed on the bone on the outside of my foot (metatarsal nr 5). I did a nice roll over all my protection and I thought "not too bad, I rolled it out, no damage here", but my foot hurt. Didn't give it much thought and kept on riding for another 45 minutes.
When getting home I saw it was quite swollen and the next morning it hurt really bad when I got out of bed and put my weight on it, so off to the hospital, and yup, a broken bone :/
I have no idea if you can even gear up to protect yourself from this kind of injury. It sucks though. Riding season is over, and when I'll be back on the road the bad weather will be upon us where I live.