being a ski patroller, the most common injury i see is torn acl's. these range from partial tears to full tears.
for snowboarders the most common is the broken or fractured wrist.
we also do a lot of backboards, most are precautionary, but nonetheless are sometimes vital. we see a handful of concussions.
traction irons (broken femurs) are a rare occurrence. we can do 1-3 a year, and 3 is a lot.