Facet Joint Injection
(Medial Branch Block; Zygapophysial Joint Injection; Z-Joint Injection)
by Pamela Jones, MA
A facet joint injection puts numbing (anesthetic) and steroid medicine into the facet joint. These are small joints that are located between each vertebra on the back of the spine.
In some people, the injection is given just at a tiny nerve branch that supplies the joint. This is called a medial branch block.
Reasons for Procedure
A facet joint injection is done to find out if a joint is the cause of back or neck pain. It may also be done to ease pain and swelling in a joint.
Problems are rare, but all procedures have some risk. The doctor will go over some problems that could happen, such as:
Smoking may raise the risk of problems.
What to Expect
Prior to Procedure
The care team may meet with you to talk about:
The doctor may give local anesthesia. The area will be numbed.
Description of Procedure
You will be asked to lie on your stomach or side on an x-ray table. The doctor may inject a contrast dye. It will help locate the joint on an x-ray. This will help guide the injection. The needle will be inserted in the joint. The anesthetic medicine will be injected. You will be asked whether the pain is relieved. If the injected eased pain, a second injection may be given to ease swelling.
If the pain is not eased by the injection, the doctor may:
The needle will be removed. A small bandage may be placed over the site.
How Long Will It Take?
Will It Hurt?
Pain is common at the injection site. It may last several hours. Medicine and home care can help.
At the Care Center
A physical exam may be done to find out how much pain has been relieved.
It will take a few hours for the injection site discomfort to go away. Physical activity may need to be limited.
Call Your Doctor
Call the doctor if you are not getting better or you have:
If you think you have an emergency, call for medical help right away.
American Chronic Pain Association
Ortho Info—American Academy of Orthopaedic Surgeons
Chronic low back pain. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/chronic-low-back-pain. Accessed September 30, 2020.
Facet joint injections and medial branch blocks. Bupa website. Available at: https://www.bupa.co.uk/health-information/directory/f/facet-joint-injections. Accessed September 30, 2020.
Last AR, Hulbert K. Chronic low back pain: evaluation and management. Am Fam Physician. 2009 Jun 15;79(12):1067-1074.
Lumbar zygapophysial (facet) joint injections. Know Your Back—North American Spine Society website. Available at: https://www.knowyourback.org/KnowYourBack/Treatments/InjectionTreatmentsforSpinalPain/LumbarZygapophysialJointInjections. Accessed September 30, 2020.
Spinal injections. American Academy of Orthopedic Surgeons Ortho Info website. Available at: https://orthoinfo.org/en/treatment/spinal-injections. Accessed September 30, 2020.
Last reviewed September 2020 by EBSCO Medical Review Board Warren A. Bodine, DO, CAQSM
Last Updated: 6/9/2021
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