well, Sacralization is congenital condition and it is incidental finding on Xray and has no bearing as such with your symptoms. you need a good consultation by an orthopaedic surgeon and need to get a good dianosis and maybe get treated accordingly. physical therapies you have undergone is going to give you temporary relief and for premanent cure you need proper work up.
personally i do spinal manipulation which can help to take care of your problem from the grass root level and may be cure yo ...
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