What are endoscopic foraminotomy and rhizotomy?
These are two related, minimally invasive procedures carried out through an opening smaller than one centimeter, using a small camera and fine instruments. An endoscopic foraminotomy enlarges the foramen - the bony tunnel where a spinal nerve leaves the spine - to relieve a nerve pinched by thickened ligament, a bone spur, or a disc fragment. An endoscopic rhizotomy instead interrupts the small facet-joint nerves (the medial branches) that carry pain signals, for back or neck pain coming from worn facet joints. They address different problems, so a careful diagnosis decides which, if either, suits you.
What happens during the procedure
Guided by live X-ray, the surgeon passes a thin tube to the target area and inserts the endoscope for a magnified, well-lit view on a screen. In a foraminotomy, the surgeon carefully trims the bone and thickened ligament crowding the nerve until it can move freely. In a rhizotomy, the pain-carrying facet nerve is identified and interrupted under direct vision. Both are usually done under local anesthetic with sedation, which keeps you comfortable while allowing the surgeon to work safely near the nerve. They are typically day-case procedures.
Benefits and considerations
The endoscope gives the surgeon a direct view of the target through a small access point. Foraminotomy and rhizotomy treat different pain mechanisms, and neither is suitable for every patient. Radiofrequency ablation may also be considered for confirmed facet-related pain; the choice depends on diagnostic findings, previous treatment and the expected role of each procedure.
These are targeted procedures, not a solution for every kind of back or neck pain. They work best when imaging and diagnostic blocks have clearly identified the source - a pinched nerve at its exit, or a specific facet joint. As with any procedure, results vary, and they depend heavily on selecting the right patient. Surgery is considered only after conservative care has had a fair chance.
Recovery and what to expect
Some procedures may be planned as day cases, while observation or an overnight stay may be appropriate in other circumstances. Activity is increased gradually. Symptoms can settle at different rates, and temporary soreness or altered sensation may occur. Your clinician will provide individual guidance for driving, work, exercise and lifting.
If another operation has been suggested, a second opinion can help clarify the diagnosis, the proposed approach and any reasonable alternatives.
How we approach your care
- 01
Find the true source
We begin with a thorough history and examination, supported by imaging where appropriate, to pinpoint the precise source of the problem.
- 02
Consider appropriate options
Where clinically appropriate, we consider established non-surgical options before surgery. The plan depends on the diagnosis, symptoms, health and priorities of the individual patient.
- 03
A plan built around you
Every step is explained clearly, so you always understand your options and what comes next.
This may help if
- A pinched nerve at its exit canal (foraminal stenosis) is confirmed on imaging
- Facet-joint pain has been confirmed by a diagnostic block
- You had good but short-lived relief from radiofrequency ablation
- Conservative care and injections have not given lasting relief
Suitability can only be assessed after reviewing your symptoms, examination, relevant imaging and previous treatment.
Common questions
What is the difference between a foraminotomy and a rhizotomy?
A foraminotomy widens the bony tunnel where a nerve exits the spine, relieving a nerve pinched by thickened ligament or bone. A rhizotomy instead interrupts the small facet-joint nerves that carry pain signals. They treat different problems, and your diagnosis - not the label - decides which, if either, is right for you.
How is endoscopic rhizotomy different from radiofrequency ablation?
Both procedures target small medial branch nerves associated with facet-joint pain. Radiofrequency ablation uses an image-guided probe, while endoscopic rhizotomy treats the nerve under camera vision. Relief varies with either approach, and the treated nerves may recover over time. Diagnosis and response to diagnostic blocks help guide the choice.
Will I be awake during the procedure?
These procedures are usually performed under local anesthetic with sedation, so you are relaxed and comfortable while remaining responsive. This can help the surgeon protect the nerve as they work. Your surgeon and anesthetist will confirm the plan that is safest for you.
How soon will I feel relief and get back to normal?
Symptoms may change gradually as irritation settles, and the response differs between patients. Return to work, driving, exercise and lifting depends on the procedure, your symptoms and the physical demands of your usual activities.
What are the risks?
Possible risks include infection, bleeding, nerve irritation, temporary numbness and changes in sensation. Your surgeon will explain the likelihood and relevance of each risk for your case.
Is this a permanent fix?
The response varies. Facet nerves treated by rhizotomy can regrow, and underlying changes in the spine continue, so symptoms may return. Your surgeon will explain what the diagnosis and previous diagnostic blocks suggest in your case.