Hi. I do not know if I can be of any help but my doc will not do Radio for the SI joints. I have selective nerve injections (both sides). They may last a year or maybe more. Radio lasts longer on my L4-L6. We usually do the procedures for both close together, a couple of weeks apart. Everyone has their own policy as to what they will perform or not do. I trust my doc that he knows what is best. Hope this helps. Happy New Year and stay safe and healthy. KLH