With arthritic conditions, I'm not sure that much, if any healing goes on. There are claims that glucosamine/chondroitin supps can help with healing damaged cartilege, but I dont know that there is any research to support this. I could be wrong of course
We have a GSD who has severe hip dysplasia and the heads of her femurs look like swiss cheese, rough, holey and very, very worn down. We had a femoral head osectomy(sp?) done on one side, which is where they cut the femoral head off, so she no longer has a hip joint on that side. She has no symptoms though, other than weakness in climbing stairs or jumping and you should see her gallop across our hillside when we come home! The only way I have managed her condition is to feed a raw diet that includes no grains. Whether this is the reason that she does so well, I can't say for sure. I keep her weight low, to less stress the joints and allow her to exercise to her own descretion as she is a mellow, older dog and doesn't overdo. But she takes no medication or supplements and she is not in an early stage of the disease.
So, from my own experience, I would recommend feeding a no grains diet, keep weight low and continue moderate/easy exercise as long as the dog is not too painful. It's important to keep the supporting muscles in the legs strong. And if my dog was very painful, I would use a pain relieving medication to keep them comfortable. Thankfully, with our two arthritis dogs, we are able to avoid that at this point.
Hope Kaya is doing okay!