There is usually ama or toxins and poor digestive fire at the root of arthritis. Panchakarma is generally advised because of the toxins. Treatment depends on the doshic imbalance associated with arthritis.
If Vata is primarily involved then stiffness, pain, and dryness and we are using warm cooked moderately spiced foods, haritaki, castor oil internally/externally, and possibly yogaraj guggulu or simhanada guggulu
If Pitta is primarily involved, then there is inflammation with burning sensations and we using greens in the diet, cooling spices, herbs that add moist and cool properties, amalaki, and possibly kaishore guggulu
If Kapha is primarily involved, then there is swelling and water retention and we are using hot pungent spices on warm cooked foods, bibhitaki, and possibly diuretics triphala guggulu or punarnava guggulu or simhanada guggulu.
Yoga is helpful for all arthritic conditions