[The proper name for the condition goes over Ivar's head, but he can very well guess what the common one entails, considering the problems he's had with his legs his whole life.]

Trust me, I've surprised everyone for the past sixteen years with my continued existence. [No one thought he'd live more than a few months except his mother.]

This explains a lot. [He's actually not being sarcastic. It was better to be able to put a proper name to what he had and actually have something he could call beyond just being crippled.]

Considering I didn't even know I had a disease until now, that would be a no.