Anesthetic Injected Once the physician has confirmed that the needle is positioned correctly, the physician attaches a syringe containing an anesthetic medication. This medication is injected around small nerves called the medial branch nerves. These carry signals to and from the facet joints. The anesthetic will temporarily block sensation in these nerves.
End of Procedure If the temporary injection relieves the patient’s pain, the physician may inject a more long-lasting anesthetic. If the temporary injection does not relieve the pain, the physician may test nearby facet joints to identify the correct one.