A facet joint injection is a shot of medicine to help with pain from arthritis. The injection goes into your neck or back. Where you get your shot depends on where your pain is.
Facet joints connect your vertebrae to each other along the back of your spine. Problems in these joints can cause long-term (chronic) pain in the neck or back.
Numbing medicine is injected into the facet joint to see if that is the cause of your pain. If it does help your pain, your doctor may add a steroid medicine to the injection. Steroids reduce swelling and pain, but they don't always work.