Facet joints are small joints that link the bones of the spine together, and allow movement and help stabilise the spine. Wear and tear, inflammation and injury to the facet joints may cause pain in some people.
A facet joint injection is used for localised spinal pain, where simpler measures have not helped. It is performed around or into the facet joint, to help determine where the pain is originating from it. Several injections to different facet joints may be needed, depending on the site of pain. The injection contains local anaesthetic, often with a small amount of steroid.
A facet joint injection works by reducing some of the pain signals from the joint and, though the effects can vary from person to person, some can get significant and long-lasting relief. It is usually undertaken alongside other treatments, such as physiotherapy.