Gutting, sorry to hear that.
An option could be to play sitting? I normally go for a tall bar stool for longer gigs (2h+) as my Geddy Jazz starts to pull my shoulder muscle after a while and ends up hurting down to my lower back the next day. Obviously nowhere nears as bad as your condition but still, sitting lets my leg take the weight and I'm much happier afterwards. Can't say I've ever had any complaints from the audience about sitting either - probably the less they see of me the better!