Nigel - I understand the frustration of not knowing exactly WHAT caused the RSD. I had plantar fasciitis that seemed to get better but then took a major turn for the worse. (thinking back, I was doing stretches and one night I stretched tighter and felt a zing but thought nothing of it. I personally think this was the turning point...from then on things went south). Anywho, all of a sudden I could not stand to rest my feet on the bed or anything. It was sooo bad! The dr. did an MRI and decided to put me in a boot (still had slight tears). Initially, I felt a little better from the boot though I didn't rest it like I should (he never told me to be non-weight bearing! Having 6 kids, I am on my feet all.the.time.). My foot (right) got worse and worse, then started to burn, etc. You get the picture. I spent 11 weeks in the boot. Didn't help things.

My first PM offered me an RF (not pulsed). I decided against it. I might consider the PRF but really I would be unsure just like you.

good luck.
Janel