There's a type of arthritis that is non-erroding and it's called Peripheral arthritis. It wax and wanes to match the inflammation in your body. Once your flare is under control, the pain in the joints ease as well. I have peripheral arthritis but it doesn't always go away for me unfortunately.
Here is a link to the CCFA that will tell you more about
it:
www.ccfa.org/info/about/complications/arthritisCopy and paste if the link doesn't work.