This site lists the first treatment for arthritis as low-carbing:

Treatment: decreasing inflammation and counteracting joint deterioration from oxidative stress and free radical damage.

Food

One of the most promising methods of treatment is through balancing the micro-hormones called eicosanoids (for example prostaglandins) by
Using protein instead of carbohydrate as your main energy source; see
Low Carbohydrate diets


http://www.loudzen.com/canary/conditions/arthritis.html