I don't think anyone ever caught me from behind unless I'd decided to ski backwards. When we had the place in Vail, the last run down to the Lionshead gondola head, where we usually ate lunch, could be fierce, when the wind was blowing up the slope. I'd typically turn around and ski down backwards. Liz would ski frontwards and advise me if I were coming up on somebody...Ha, there are few slopes in the US that have not hosted one of my garage sale wipeouts. But most of my injuries were from inattentive or inexperienced skiers hitting me from behind. Good luck with your procedure.