Yeah, I had mine a month or so before my RFA...

basically you try out the 'numbing/deadening' of those nerves with a temporary fix., then after you have tried it and liked the effect you are set to go ahead with the more complex and hopefully longer-lasting RFA...I would think its silly to get an RFA if you havent had the area tested first to see if you may benefit from it. I guess it is possible that your scans show you have dodgy facet-joints and its obvious to the Doc. that this is your pain generator.