Facet joints are a series of small joints at the back of your spine. Sacroiliac joints are 2 large joints at the back of your pelvis. Both facet and sacroiliac joints can become painful when injury or wear and tear damage them. Joint injections can be useful in identifying precisely where the pain is coming from so that more accurate and effective treatments can be provided. Epidural injections are done into a narrow space of the spine adjacent to the spinal nerves and discs. They help identify which nerve is irritated and can reduce the pain from that nerve

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