Medial Branch Block Injections in Miami
A medial branch block is a precise, image-guided injection used to diagnose — and sometimes treat — pain originating from the facet joints of the spine. Because facet joint pain can closely mimic other causes of neck and back pain, a medial branch block is one of the most valuable diagnostic tools in interventional spine care. It is also the essential first step for patients considering radiofrequency ablation (RFA) for longer-lasting relief.
At our Miami clinic, Dr. William Bonner performs all medial branch block injections under fluoroscopic (X-ray) guidance to ensure precise needle placement and maximal diagnostic accuracy.
What Is the Medial Branch Nerve?
Each facet joint in the spine is supplied by two small nerves called medial branch nerves — one from the level above and one from the level below. These nerves carry pain signals from the facet joint to the brain. A medial branch block works by injecting a small amount of local anesthetic directly along these nerves, temporarily numbing them.
If your pain significantly decreases after the injection, it confirms that the medial branch nerve — and therefore the facet joint it supplies — is a primary source of your pain. This diagnostic information is critical for guiding your treatment plan.on.
What Does Facet Joint Pain Feel Like?
Facet joint pain can vary depending on which region of the spine is affected. Common patterns include:
Cervical Facet Pain (Neck)
- Pain in the neck, upper back, or between the shoulder blades
- Headaches, often at the base of the skull
- Pain that worsens with looking up or turning the head
- Stiffness and reduced range of motion in the neck
Lumbar Facet Pain (Low Back)
- Low back pain, often on one or both sides
- Pain that refers into the buttocks or upper thighs (but typically does not travel below the knee)
- Pain that worsens with extension (arching the back), twisting, or prolonged standing
- Stiffness, especially in the morning or after prolonged sitting
An important distinction is that facet joint pain typically does not cause radiating pain down the leg past the knee or down the arm past the shoulder — those patterns are more suggestive of nerve root irritation, which may be better addressed with an epidural steroid injection. This is why accurate diagnosis matters.
Medial Branch Block vs. Facet Joint Injection: What Is the Difference?
| Medial Branch Block | Facet Joint Injection | |
| Target | Nerves supplying the facet joint | Inside the facet joint itself |
| Primary Purpose | Diagnostic confirmation + therapeutic | Diagnostic + therapeutic |
| Required Before RFA? | Yes — confirmatory blocks required | No |
| Medication Used | Local anesthetic (± steroid) | Local anesthetic + steroid |
| Duration of Relief | Hours to days (diagnostic phase) | Weeks to months (therapeutic) |
Both procedures are performed under fluoroscopic guidance at our Miami clinic. Dr. Bonner will determine which approach is most appropriate based on your symptoms, examination findings, and treatment goals.
When Is a Medial Branch Block Recommended?
A medial branch block may be recommended if you:
- Have chronic neck or back pain that has not responded adequately to physical therapy and medication
- Have pain that is primarily axial (in the spine itself) rather than radiating down an arm or leg
- Have pain that worsens with extension, twisting, or prolonged standing
- Have imaging findings consistent with facet arthropathy
- Are being evaluated as a candidate for radiofrequency ablation (RFA)
- Have had some relief from a prior facet joint injection and need confirmatory diagnostic blocks
Most insurance and clinical protocols require two separate diagnostic medial branch blocks on different visits before authorizing radiofrequency ablation. Dr. Bonner follows evidence-based protocols for this pathway.
Conditions That May Benefit From Medial Branch Blocks
- Facet joint arthropathy (facet arthritis)
- Chronic neck pain without radiating arm symptoms
- Chronic low back pain without radiating leg symptoms (non-radicular)
- Referred pain into the shoulders, buttocks, or upper thighs from facet joints
- Spine pain related to degenerative changes at multiple levels
- Post-surgical spine pain with a suspected facet component
The Medial Branch Block and RFA Pathway
Medial branch blocks are the essential diagnostic step before radiofrequency ablation. Understanding this pathway helps set appropriate expectations:
Step 1: First Medial Branch Block
A local anesthetic is injected along the medial branch nerves at the suspected levels. You track your pain relief in the hours following the procedure. Significant, temporary relief supports the diagnosis of facet-mediated pain.
Step 2: Second Confirmatory Medial Branch Block
Most protocols require a second diagnostic block — often using a different anesthetic — to confirm reproducible relief before proceeding. This two-block protocol reduces the rate of false-positive diagnoses and ensures that RFA is offered only to patients most likely to benefit.
Step 3: Radiofrequency Ablation (RFA)
Once facet-mediated pain is confirmed with two positive diagnostic blocks, radiofrequency ablation can be performed to provide longer-lasting relief — typically 6 to 12 months or more — by disrupting the medial branch nerves that transmit pain from the facet joints.
Why Is Fluoroscopic Guidance Essential?
Medial branch nerves are small structures that cannot be accurately targeted without imaging. Fluoroscopic guidance allows Dr. Bonner to visualize the spine in real time, confirm needle position with contrast dye, and deliver the medication precisely into the joint or along the medial branch nerve. This is essential for both diagnostic accuracy and therapeutic effectiveness.
Without image guidance, the diagnostic value of the injection is unreliable — if the needle is not in the correct location, a negative response does not truly rule out the facet joint as a pain source. Dr. Bonner performs all facet joint injections under fluoroscopy as the standard of care.
What to Expect During a Medial Branch Block
The procedure is performed in-office and typically takes 15 to 30 minutes:
- You are positioned lying face down on a procedure table
- The skin over the injection site is cleaned and numbed with local anesthetic
- Using fluoroscopy (live X-ray), Dr. Bonner precisely targets the medial branch nerves at the appropriate spinal levels
- A small amount of contrast dye confirms accurate needle position before any medication is delivered
- Local anesthetic (with or without a small amount of corticosteroid) is then injected
- You are monitored briefly and then go home the same day
Important: After the procedure, you will be asked to carefully track your pain levels during the next several hours. This feedback is essential diagnostic information and directly guides the decision about whether to proceed with RFA.
Medial Branch Block Injections vs. Epidural Steroid Injections: Which Do I Need?
One of the most common questions patients have is whether they need a facet injection or an epidural injection. The answer depends on the source of your pain:
| Medial Branch Block Injection | Epidural Steroid Injection | |
| Pain Source | Facet joint (joint itself) | Nerve root (pinched or inflamed nerve) |
| Typical Pain Pattern | Axial pain (neck or back); may refer to shoulders, buttocks, or upper thighs | Radiating pain down the arm or leg (radiculopathy/sciatica) |
| Target | Medial branch nerve | Epidural space around spinal nerves |
| Diagnostic Value | Confirms facet joint as pain source | Therapeutic primarily; some diagnostic value |
| Follow-Up Option | Radiofrequency ablation (RFA) for longer-lasting relief | Regenerative medicine or repeat injection |
In some patients, both facet joint pain and nerve root irritation may coexist, and a combination of treatments may be appropriate. Dr. Bonner will determine the best approach based on your examination, imaging, and symptom pattern.
Who Is a Good Candidate for a Medial Branch Block Injection?
You may be a candidate for a medial branch block injection if you:
- Have chronic neck or back pain that has not responded adequately to physical therapy and medication
- Have pain that is primarily axial (in the spine) rather than radiating down an arm or leg
- Have pain that worsens with extension, twisting, or prolonged standing
- Have imaging findings suggestive of facet arthropathy (though imaging alone cannot confirm the diagnosis)
- Need a diagnostic procedure to determine whether the facet joints are contributing to your symptoms
- Are considering radiofrequency ablation and need a confirmatory diagnostic block first
A thorough evaluation including medical history, physical examination, and imaging review is essential before any injection is performed.
Frequently Asked Questions About Medial Branch Block Injections
Is a medial branch block joint injection painful?
Most patients experience mild discomfort from the initial numbing injection. Once the area is anesthetized, the medial branch block itself causes minimal to no pain. The procedure is generally well-tolerated.
How will I know if the medial branch block worked?
You will be asked to rate your pain levels in the hours after the procedure. A significant reduction in your typical pain pattern — 50% or greater is the standard threshold — is considered a positive diagnostic response and supports the facet joint as a pain source.
Do I need two medial branch blocks before RFA?
Yes. Standard evidence-based protocols and most insurance requirements call for two separate positive diagnostic medial branch blocks before radiofrequency ablation is performed. This two-block approach reduces false-positive diagnoses and helps ensure patients are good candidates for RFA.
How long does the relief from a medial branch block last?
The local anesthetic used in a diagnostic medial branch block typically provides relief for a few hours to a day or two. The goal of the diagnostic block is not prolonged relief — it is diagnostic confirmation. If a steroid is included, some therapeutic benefit may extend for weeks to months.
What happens if my medial branch block is negative (no relief)?
A negative result means the facet joint is likely not the primary source of your pain. Dr. Bonner will review your results and consider other diagnostic possibilities — such as disc-related pain, sacroiliac joint dysfunction, or nerve root irritation — to guide the next steps in your care.
Are there risks to a medial branch block?
Medial branch blocks are considered very safe when performed under fluoroscopic guidance. Potential side effects include temporary soreness at the injection site and a brief temporary increase in pain. Serious complications are rare.
Can facet joint pain be treated with regenerative medicine?
In some cases, regenerative treatments like PRP may be considered for facet joint pain as part of a comprehensive treatment plan. Dr. Bonner can discuss whether regenerative options are appropriate for your specific condition during your consultation.
Schedule a Consultation
If you are experiencing neck pain, low back pain, or facet joint pain and want to determine whether a medial branch block injection is appropriate for you, we are here to help.
Contact our Miami clinic to schedule an appointment with Dr. Bonner, or book online through ZocDoc for available appointment times (if you do not see availability, please reach out to us directly at 786-522-4959).