Unfortunately there seems to be no cure, at least not at the present time, for arthritis. A recent US government sponsored study concluded that dietary supplements do not slow down deterioration of joints, nor do they help in pain reduction. A placebo had basically the same effect.
It seems that joint cartilage deterioration is part of getting older. Some day, there might be a cure, but at the present time pain medication might help the discomfort, but there seems to be nothing out there that would prevent the loss of cartilage.