Knee replacement surgery?

Victoria

Hi. So my dad is getting ready to have knee replacement surgery. I wasn't too worried about it until he sat me down to have the whole "if anything were to happen to me" talk. I know thousands of people get this surgery and it's not like heart surgery or something but now I'm starting to worry. I know he wasn't trying to freak me out, he's just being responsible but I'm officially wigged. Should I be worried?