Andrea, I had mine 11-15-08 for SI joint pain (pelvis area) It was done with aid of a CT scan machine. I was very uncomfortable afterward for about 10days. My pain was lowered, not eliminated, but I was able to get off pain meds for about 8-10 weeks. I don't think I will try another one, just not enough results...and was costly too. Feel free to pm me if you have any questions..!