For equipment and contraindications see spinal interventional procedures.
The typical capacity of facet joint is approximately 2mls. Injection of large volumes can cause capsular disruption, and discharge of the anaesthetic and steroid mixture into adjacent soft tissues, including the epidural space.
Although early studies reported reasonable long term relief of symptoms (20 - 54%) more recent studies have suggested that steroid injection "is of little value". Short term relief is common however (59 - 94%) and therefore it remains a useful procedure especially to confirm the diagnosis.
- Resnick & Kransdorf "Bone and joint imaging" 3rd Edition, Elsevier Saunders