The subjects will undergo a specific physical exam of tests reported to be diagnostic of sacroiliac joint (SIJ) pain prior to receiving the routine injection in the SIJ that which is being performed as part of their normal medical care. Routine care involves use of any number of these tests, but doesn't routinely include assessment of all 6 tests in all patient's treatment. The subject will fill out a Visual Analog Scale for pain and a pain drawing prior to and after the injection.