I have some experience with elbow dysplasia. I took Zoe to the vet around December last year because she was limping so bad on her right leg. The vet took X-rays and could see where the problem was. I'm not positive on the terms he used, as it has been a while and we have had many more issues since then. He did not recommend surgery in her case, but gave her a depomedrol shot. It did wonders for her, but only lasted about 6 weeks. The shots are pretty strong so the vet did not want to give them too often. The last resort was going to be direct injections (I'm sorry but I can't remember what kind of injection) into the elbow joint. But that can also be hard on the joint, even though it would significantly help pain and limping. Zoe has since been diagnosed with lymphoma, so we have not gotten the shot again because she is on prednisone for the lymphoma. But I recommend looking into it.
I'm sorry that my info is somewhat vague, but I hope it helps a little.