I don't know about the specific break you have being common, but yes hands, wrists, arms, ribs, legs, all kinds of breaks are pretty common in snowboarding.
When you're participating in an extreme sport, you take that risk ) =
Hope you hand heals up well and you dont have bad long lasting affects
"When I do good, I feel good; when I do bad, I feel bad. Thatís my religion." - Abraham Lincoln
Moral of the story: If your going to rob people, wear a diaper.