One of my granddogs (GSE) just had this done 6-8 months ago. It helped somewhat, but his problem is hip displasia. He manages with pain medication. It is just sad to see him struggle. I would have put him down a long time ago, but his eyes are bright, he loves his food and going outside to "play," and still wants to be in the middle of everything my 6- and 8-year old grandsons are doing. Until then, I guess he will keep on truckin.
ETA - it's very costly!!