Hm…I’ve never really thought about it, actually. One thing for sure is that you will feel impact on your knees from falling. No matter how experienced you are, you can’t control how you’re going to land when you stuff up an element. There is a chance you could fall on your knees. Putting falling over aside, figure skating uses your legs a lot. You’re spinning with them, landing on them, use them to help you get into the air for a jump, and footwork. I’m a figure skater working on singles only. I haven’t started on any doubles, so unfortunately, I have no experience with how much impact there could be for those bigger kind of jumps, and single jumps don’t have that much impact, considering I’ve never even noticed any painful impact when landing my jumps. I’m probably not the best figure skater to ask, so try asking around to other figure skating blogs as well for more advice. I’m sorry I couldn’t do more, sweets. Good luck!
Happy skating~! <3