I also suffer with pain that is believed to be caused by the SI joints. I am also fused at L5-S1, which can lead to SI dysfunction. Next week I am having a diagnostic injection into the joint. Assuming this provides relief, even just temporary, then I will proceed with a minimally invasive procedure called LinQ, by a company called PainTeq. The reviews sound very promising. I will share how my injection turns out and how we will proceed.