If you are talking about the Theragesic Patches that warm as you wear them, I have used them. They helped me a lot. I used them for back pain, but they do make the different sizes for different areas of the body. It is like having a heating pad on, that you can go everywhere with. I think they are quite costly, but hey, they help.
Don't walk in front of me....I may not follow
Don't walk behind me....I may not lead
Walk beside me..and be my friend...
and Lord, put your arm around my shoulder and your hand over my mouth