I'd like to know how your SIJ was assessed. Certain issues gain excess (fad) focus sometimes, and I wonder did you have the five battery test to actually prove you have SIJ. For this to be so, you must have 3/5 +ve's. Or was one test completed and this became your diagnosis. There are many back and hip problems that can also the cause of SIJ-type symptoms, so I'm not yet sold on you as and SIJ issue. The battery includes: Distraction, compression, Gaenslen's, FABERs, Thigh Thrust.