Thank you PIKate! I was thinking along the same lines. She is 10 years old so I'm hopeful that she has a lot of life left in her, but at the same time her age worries me a bit for anesthesia.
The accident happened a little over three weeks ago while I was gone for the weekend so I don't really know what happened. At the time she had peed and pooped all over the bathroom and since there was blood in her urine, I took her to the vet immediately. It wasn't until after we got home that night that I noticed she was holding her back leg out to the side a bit when she was sitting. Within 2 days she started limping terribly so I called the vet and they put her on metacam, but only for a couple of weeks. After about 9 days she stopped limping completely so I discontinued the Metacam as I was worried about the scary side effects I've read here. About a week after that she started limping slightly again. When he checked her tonight for follow-up of the UTI, I had him check the leg and he saw that her knee was swollen a bit. I'm hopeful that since she stopped limping for a solid week that giving her more time on the Metacam and additional rest to heal will get her back in shape, at least enough that we can avoid surgery.
I truly appreciate the encouragement!