My Lily had this done although she wasn't my dog at the time. Her previous owner had brought her into the vet clinic I work at to have her euthanized at 2 years old because she didn't want to spend the money for her surgery.
The Vet that owns the clinic took her in and did the surgery and I ended up taking her home several months later. She definitely gets around a lot better now than she did prior to the surgery but she still walks with a slight limp. She's 4 years old now and still very much a playful pup and sometimes when gets excited and runs through the house like a crazy dog, she'll cry out. I started giving her Cosequin and I know there are varying opinions on it but I honestly think it has made a difference. Before I started giving it to her, there would be times she would hold that leg up and not want to use it and I haven't seen her do that for a long time.