1. What is it? Any common name for this procedure?
Both Facet Injections and Medial Branch Blocks (MBB) are minimally invasive procedures used to diagnose and treat back or neck pain arising from the facet joints (the small joints between the vertebrae that allow for spinal flexibility).
- Facet Joint Injection: The physician injects a small amount of local anesthetic and/or corticosteroid directly into the joint capsule. This is typically done to reduce inflammation and provide pain relief.
- Medial Branch Block (MBB): The physician injects an anesthetic near the medial branch nerves. These are the small nerves that transmit pain signals from the facet joints to the brain. This is primarily a diagnostic test to see if these specific nerves are the source of your pain. If the block is successful, it may lead to a more permanent procedure called Radiofrequency Ablation (RFA).
Common Names:
- Zygapophysial (Z-joint) Block
- Facet Block
- MBB
- Diagnostic Spinal Block
2. Common Symptoms: When to Meet a Doctor
Pain originating from the facet joints is often "mechanical," meaning it changes with movement. You should consult a pain specialist if you experience:
- Localized Pain: Deep, aching pain in the neck or back that doesn't usually radiate past the knee or elbow.
- Pain with Extension: Pain that worsens when you lean backward or twist your spine.
- Morning Stiffness: Feeling "locked up" in the morning, which improves slightly as you move throughout the day.
- Tenderness to Touch: Sharp pain when a doctor presses directly over the spine in the affected area.
- Absence of Radicular Pain: Unlike a "slipped disc," facet pain usually doesn't cause the "electric shock" feeling down the legs (sciatica).
3. List of Associated Diseases
These procedures are used to manage pain caused by structural changes in the spine:
- Facet Joint Syndrome: Chronic inflammation of the joint itself.
- Spondylosis: Age-related wear and tear (osteoarthritis) of the spinal joints.
- Degenerative Disc Disease: As discs thin, more weight is placed on the facet joints, leading to irritation.
- Whiplash or Trauma: Sudden injury that sprains the joint capsules.
- Spondylolisthesis: When one vertebra slips forward over another, putting stress on the facet joints.
4. List of Screening Tests
Because "back pain" can come from many places (muscles, discs, nerves), doctors use these tools to rule out other causes:
- Physical Exam (Kemp’s Test): A maneuver where the doctor has you lean back and rotate to see if it reproduces the pain.
- MRI or CT Scan: Used to look for arthritis in the facet joints or to ensure the pain isn't coming from a herniated disc.
- X-ray (Fluoroscopy): Standard X-rays can show "joint space narrowing" or bone spurs. Real-time X-ray (fluoroscopy) is mandatory during the actual procedure to ensure the needle reaches the tiny medial branch nerve or joint.
5. Am I Eligible for this Procedure?
Eligibility is based on your response to standard care.
You are a candidate if:
- You have had localized spinal pain for more than 3 months that has not improved with physical therapy or anti-inflammatory medications.
You are NOT eligible if (Contraindications):
- You have an active infection (systemic or at the site of injection).
- You have a bleeding disorder or are unable to temporarily stop blood thinners.
- The pain is clearly caused by a large disc herniation or a tumor.
6. Pre and Post Care
Pre-Care (The Preparation):
- Blood Thinners: You must stop medications like Warfarin, Aspirin, or Plavix for a specific number of days before the procedure to avoid spinal bleeding (hematoma).
- Ride Home: You cannot drive yourself home because your legs or arms may feel temporarily heavy or numb.
- Pain Diary: Most doctors ask you to track your pain levels in the hours following the injection. This "diary" is the most important data for determining if the procedure worked.
Post-Care (The Recovery):
- Activity: Rest for the remainder of the day. You can usually return to work and normal activity the following day.
- Site Soreness: You may have temporary "injection site" pain. Use an ice pack (20 minutes on, 20 minutes off) to help.
- Monitor for Relief: For an MBB, the relief is often immediate but short-lived (hours). For a Facet Injection with steroids, it may take 3 to 7 days to feel the full anti-inflammatory benefit.
7. Days Required for Hospitalization
Both procedures are performed as outpatient clinical services.
- Procedure Time: 15 to 30 minutes.
- Recovery/Observation: 30 to 45 minutes.
- Hospitalization: 0 Days.
Disclaimer: As per doctor’s advice, the frequency of these injections (usually limited to 3–4 per year) may get modified based on your long-term response and the risk of steroid side effects.
7. Days Required for Hospitalization
- Diagnostic Accuracy: These tests are the only way to prove for certain that the facet joints are the source of your pain.
- Pain Reduction: Provides a window of relief that allows you to participate in physical therapy and strengthen the muscles supporting your spine.
- Avoidance of Major Surgery: Successfully managing facet pain can delay or prevent the need for more invasive spinal fusion surgeries.
- Pathway to RFA: If an MBB provides $50\text{-}80\%$ relief, it confirms you are a candidate for Radiofrequency Ablation, which can provide pain relief for 6 to 18 months.
