Particulate Corticosteroid Versus Non-particulate Corticosteroid for Sacroiliac Joint Injection

Inclusion Criteria: * Aged \>18, capable of understanding and providing consent in English, capable of complying with the outcome instruments used, capable of attending all planned follow up visits * Unilateral low back/buttocks pain of at least 2 weeks. * Patient reported 7 day average of numeric pain rating score (NPRS) low back/buttocks pain of at least 5/10 at baseline evaluation * Clinical diagnosis of sacroiliac joint pain as diagnosed by a board certified Physiatrist including history of low back/buttocks pain and at least 2 positive physical exam findings (including positive fortin finger sign, pain with palpation of posterior superior iliac spine, positive FABER's test, positive Gaenslan's test, positive sacral distraction, positive thigh thrust, positive lateral compression, positive sacral thrust) * Patient consents to sacroiliac joint corticosteroid injection in a shared decision-making process with the treating physician. * 80% or more relief of index pain within first 5-15 minutes after injection Exclusion Criteria: * Clinical suspicion of alternative process is greater than clinical suspicion of sacroiliac joint pain * Those receiving remuneration for their pain treatment (e.g., disability, worker's compensation). * Those involved in active litigation relevant to their pain. * Those unable to read English and complete the assessment instruments. * Those unable to attend follow up appointments * The patient is incarcerated. * History of prior sacroiliac joint…