Was the surgery finally a failure?

My dog had cruciate surgery almost three months ago. I was warned that recovery takes time but I notice that perhaps other than stabilizing the knee nothing more was achieved. Am I being hasty? The dog still limps around, especially after having rested for hours. While running she lifts the leg of the ground.

I think my only mistake is that I am not working on her weight loss enough and that I suppose is making things worse. The heavier she is the more weight the bad leg has to bear. I am trying though. I am worried that arthritis is setting in and the poor soul will be in pain. What do you know about this kind of surgery?