Radiofrequency Ablation

Radiofrequency ablation (RFA), also known as rhizotomy, is one of the newest pain control techniques. In this non-surgical procedure, radiofrequency waves are delivered to certain nerves, with the goal of interrupting pain signals to the brain.

RFA typically targets pain from the facet joints, which can contribute to chronic pain in the neck or lower back, and the sacroiliac joints, which can contribute to chronic low back pain.

Facet joints are pairs of small joints located at each vertebral level of the spine. Each facet joint is connected to two medial branch nerves that carry signals, including pain signals, away from the joints to the spine and brain. The sacroiliac joints are located at the lowest part of the spine, between the sacrum and ilium in the pelvis, and are also connected to nerves that carry signals to other parts of the body.

RFA can also be used to treat stomach pain caused by pancreatic cancer or pelvic pain caused by ovarian cancer.


  • Please arrange to have someone drive you home after the procedure, as you will not be able to drive or operate machinery for at least 24 hours after the procedure.
  • Do not eat or drink anything after midnight the night before the procedure, except for a small amount of water if needed to take medications on the day of the procedure.
  • If you have diabetes and use insulin, you must adjust the dosage of insulin the day of the procedure. Consult the doctor who manages your insulin or diabetes medication for any necessary adjustments. Bring your diabetes medication with you so you can take it after the procedure.
  • If you take any blood thinning medications or antiplatelet medications, these must be stopped with the permission of your doctor who manages these medications.
  • Continue to take all other medications with a small sip of water. Bring all medications with you so you can take them after the procedure. It is important to note that you must not stop taking any medication without first consulting with your primary or referring doctor.


RFA is a minimally invasive procedure that does not require anesthesia. During the procedure, you will lie on your stomach, or for some neck procedures, on your side. You may have an intravenous (IV) line so we can administer a sedative to relax you.

Your doctor will numb a small area of skin around your spine with an anesthetic. The doctor will then use X-ray guidance to direct a special radiofrequency needle alongside the targeted nerves. To confirm proper position, a small amount of electrical current is passed through a probe placed in the needle to the targeted nerve. At this point, you may experience brief pain or a muscle twitch, which the doctor will discuss with you at the time.

Once proper position is confirmed, more local anesthetic is given to the area where the RFA will be performed. During the procedure, most patients feel either nothing or a mild warm sensation.

The procedure may take one to two hours, depending on the treatment site and number of treatments performed.


After the procedure, you may experience soreness in the targeted area for a few days. Rare complications include infection, bleeding and nerve damage.

Although results vary from patient to patient, the effectiveness of RFA may last from three to 12 months. Often the nerve will eventually regenerate and in some cases, the joint pain may return.


Reviewed by health care specialists at UCSF Medical Center.

Related Information

UCSF Clinics & Centers

Pain Management Center
2255 Post St.
San Francisco, CA 94143-1654
Phone: (415) 885-PAIN (7246)
New Patients: (415) 885-3552
Fax: (415) 885-3883

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