In the past 4 years I had a foramenotomy at L4-L5 and a fusion at L5-S1. Now I am experiencing a lot of pain in my SI joint. I have had SI injections and 8 weeks of therapy but the joint keeps slipping out of place. Anyone have experience with this and have you tried ablation or Platelet Rich Plasma therapy to get the pain reduced? Is there a good medicine to help relieve SI pain. Nothing I have tried has worked so far. Thanks.