@sandyincharlotte, my kid also has type 1 and long term SI joint issues, due to subluxation. She did PT all during college and for a total of 10 years. Prolotherapy helped her miraculously but NOT the sugar/dextrose one.

In the practice she used, dextrose is tried first, then PRP, platelet rich plasma. Due to her type 1, they skipped the dextrose trial and went directly to PRP. So I would ask for that.

Dr. Borg-Stein at Newton-Wellesley in MA is doing a lot of studies and could refer you perhaps.