I have booth RA and OA - in the same joints it seems. Every time I tell my rheumy about joint pain (thumbs, hands, wrists, or in my feet usually) she chalks it up to OA - which she doesn't treat.
So I do I know the difference. It all hurts (fibromyalgia doesn't help), no redness or major swelling, and my inflammatory markers are low. It gets so very frustrating!