Onions are very rich in sulfur. Sulfur is a mineral that has great anti-inflammatory properties that can help to prevent cartilage damage in the body.
Walnuts contain good fats and manganese, which is an important mineral for cartilage repair and the reduction of inflammation in the body. Manganese helps glucosamine, a property necessary for the building of cartilage. Eating 1/2 to one ounce of walnuts everyday can be excellent for cartilage.