The word "cripple" is literally a dictionary defined pejorative/slur. You'd never call someone with a permanent disability a "cripple" or describe them as being "crippled" so why would you think it's OK to refer to someone with a temporary disability that way? Getting rid of all language that is insulting to disabled people is pretty hard (e.g. stopping all use of blind or deaf as metaphor for being terrible at something). But at the minimum we should be able to avoid referring to people or conditions by a literal slur.
