I don't know if my painful glutes are the same thing as what you are experiencing, but I have had SI joint injections... to no avail. It always feels like I am sitting in something hard in each butt cheek when I am sitting. I ad some very temporary relief fromt he pain afew months ago after a trial of the morphine pain pump. The pain almost disappeared, but I could still feel whatever it was in or under my glutes. I had the pain pump implanted back in April and, so far, that pain still has not gone away. Still trying to get the dosage adjusted to get the same relief I had during the pain punp trial which brought my pain level down from about an 8 to a 2. Had pump evaluated for proper operation and med delivery and all seems to be good.