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Sacroiliac Joint Pain, or Sacroiliitis, is the term used to describe inflammation of one or both of the Sacroiliac joints. The Sacroiliac joints are located where the pelvis connects to the lower spine, and are primarily used to absorb shock from the spine. Sacroiliitis most often results in pain in the hips, legs, buttocks and lower back. Sacroiliitis may be confused with Sciatica, which is pain stemming from the Sciatic nerve.