Our vet did something with a young horse that had arthritis where he took culls from somewhere in the horses back and injected it into his legs where he had the arthritis, he was out for a while and had to be slowly brought back to work but now he's good as new
Try using infrared light therapy, this has worked wonders for me and my horse. It is a better option than injections because injections only lubricate the joint, this heals it. This will give you more information http://www.emersonww.com/EquinePainProds.htm
I tried a lot of stuff never really worked, as soon as it goes away the pain comes. If your horse doesn't have a serious case of arthritis maybe you should talk with your vet and ask him/her about the steam cells procidment, I didn't try it but I've heard good things about it
Hi Andreia, did you try steroid injections? I've given him them and he came sound he's now lame Again and I am umming and ahhing about doing it again. Thoughts?
My boy has the same problem (it happened because his previous owners didn't care about him and didn't have the proper care after jumping with him) I had to retire him from competitions and he's just a horse to go on walks and enjoy
When you jump the fetlock takes a ton of impact, your horse may get even more pain or arthritis. I would jump him smaller and see how he does in a month or so