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Skiing may be worse for ligaments, but I think snowboarding is worse for cartilage. (Also anecdata)
Skimo is the real danger though. Often done in terrible conditions, on ridiculous skis that snap if you look at them the wrong way, with bindings that don't release reliably and wearing no more than a road cyclist. -
I think pelvic injuries might be a feature of snowboarding too. I know one who dislocated (?) The cartilage joint at the bottom of his pelvis by landing sideways on his hip after a jump.
Frankly the idea of being irreversibly strapped to a plank gives me the jibblies, but I always have my ski bindings set pretty light anyway.
Snowboarding is also terrible for knees, especially the back one!