This isn't really related, but our dog had ACL surgery (I think it "runs in the family", as my mom and I both did, too!). It was definitely tough on her - I felt horrible driving home when she'd whimper at every slight jostling. We took her to doggie rehab (they had a tank so that she could swim/walk in water to strengthen her legs with low impact) for a few weeks, and just gradually built up her tolerance.
5+ years later, she's doing great.

Sure, she'll act all gimpy and "oh, woe is me, sitting is so hard to do", but then somehow she miraculously finds a way to stand up on her hind legs to steal food off the counters.

So..different species, and different problem, but having leg surgery isn't the end of the world.

We also had a cat who was run over by a car rehab successfully in a shower stall for 2-3 months..she broke her pelvis and couldn't move, and broke her jaw and had it wired shut for a few weeks. That was fun. (She recovered fine and lived for another 15 years.)
Good luck!