Yup, that is all it took for me. Both my mom and brother have had them in their spin. Both have back problems. Moms is from a car accident and my brothers is from falling off a laddar. He had two disc that rub each other and one is almost gone. He lives in pain.labs4life said:I have arthritis but I never had any injection for that, I did get a cortisone shot in the knee once. The operative word is once. I will never,ever consciously let someone do that again.