I'm certainly not a doctor so this is just my experience with my pain doc. He (and I'm sure all of them) uses an x-ray to determine which nerves to target. Once he finds the correct nerve he'll insert a catheter and send an impulse to make certain he's on the correct nerves(s). He calls this the thumper since it'll cause your leg to jump with the impulses. Then he'll use the RF waves to "burn" or destroy that nerve. For my procedures he targets both sides.
This doesn't cure the problem with my back but mainly reduces the pain. I have complete function. Now I'm no athlete and when I overdo things I will get pain. But mostly this eliminates or minimizes the daily aching and pain. I no longer take any pain pills and since I've been using CBD oil I no longer take NSAIDs.
He also gives me the choice between doing this with a local or a general in a surgery center. Doing this with a local is a much quicker recovery since you're awake the entire time and I'm in and out in less than an hour total time. I was a little concerned the first time but the Xanax helped.
Hope this helps, for me it does and is keeping me from having surgery. I probably will have to have surgery at some point but will do this as long as it has the desired effect. And hopefully surgical or other techniques will have better outcomes by the time I need it.