I don't know much about arthritis etc, however, Farmers walks and Deadlifts have done wonders for my grip strength and have brought SOME growth to my forearms.
I beleive that building strength in your forearms would bring you more benefit then building mass though for arthritis so look into deadlifts/farmers walks, very little stress on wrists but very good for grip/forearm. (I broke my wrist a while ago and cant move my right wrist in a full ROM to do a wrist curl so I'm stuck with heavy forearm work without moving my wrist and these two movements work best for me)
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