What are facet joint and S-I (sacroiliac) joint injections?
Sometimes lower back pain may come from different joints in the lower back. A facet joint injection is done to reduce inflammation in a joint that is felt to be the source of pain. Precise x-ray guided injections of cortisone and anesthetic can diagnose as well as treat these painful joints. An epidural injection is done when disc herniation or a narrowed spinal canal causes nerve root irritation or compression.