I've heard of this sort of stuff. I think it's mostly mental and 5% of they say it is. I haven't had the chance to try this roto grip thing, and i just found out that it even existed from this post, but I've tried things that are similar to it, such as magnet strips that are supposed to go down your back for backaches and on the forehead for a headache and there's some other ones as well.  Well, at least for me and the ones that I've tried, this didn't work.  Not for my major headache and a leg pain that it was supposed to help.  It has to do something with the magnets and your muscles but I don't know all the science behind it.  My dad uses the stuff that's the only reason why I tried it in the first place and it works for him, so I dunno.  Maybe it's a mental thing that if he thinks that it can heal him then his mind actually heals him and not the magnets but having the magnets on puts him in that train of thought that it will help him so it maybe strengthen his mind.  I dunno, it seems all too much of a hoax to me but it works for him apparently so it might for you.  I'd do some searching and research on the internet and on google first before I'd get into this kind of stuff and if it's suited for your current/future body conditions.  I'd also try searching for stuff on  www.webmd.com   they've got everything to do with anything on that site if it's related to your body as far as I know.  Hope this helps.  The only reason why I actually wrote something long for once was because I can't sleep, hey, maybe I need those magnets