Dr. Neal Barnard calls these "pain safe foods" in his book "Foods That Fight Pain" (see below).
"Pain-safe foods virtually never contribute to arthritis or other painful conditions. These include Brown rice Cooked or dried fruits: cherries, cranberries, pears, prunes (but not citrus fruits, bananas, peaches, or tomatoes) Cooked green, yellow, and orange vegetables: artichokes, asparagus, broccoli, chard, collards, lettuce, spinach, string beans, summer or winter squash, sweet potatoes, tapioca, and taro (poi) Water: plain water or carbonated forms, such as Perrier, are fine. Other beverages—even herbal teas—can be triggers. Condiments: modest amounts of salt, maple syrup, and vanilla extract are usually well-tolerated." (Foods that Fight Pain, pp. 78-79)
"Pain Safe" foods are obviously quite healthy... if bland in some ways.
Because the most common grains are prohibited... wheat, corn, oats, and even rye... it can be difficult to arrange ordinary meals.
Refer to the last section of Barnard's book to see some menu plans that help one learn to eat in a "pain free" way (Foods That Fight Pain, pp. 225ff).
Admittedly, most people have never heard of "rice bread" or thought of having "peachy sweet potatoes" for breakfast as Dr. Barnard's dietitian suggests.
If, however, arthritis pain is caused by the wrong foods, then finding "pain free" foods is essential and may require some new food choices to be chosen.
While keeping strictly to an elimination diet may be difficult and may be impossible for some, the effort to boost one's intake of healthy, antioxidant rich foods can't hurt.
Best wishes in adapting your diet to ease your arthritis pain.