RFA Using Multi-Tined Electrodes vs.Traditional Electrodes for Lumbar Spondylosis

NCT ID: NCT06477094

Last Updated: 2025-06-08

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 25 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-08-09
• Study Completion Date: 2026-07-01

Brief Summary

Spondylosis is an anatomical defect of the small facet joints between the spinal vertebrae often due to load bearing and mechanical wear. It is a major contributor to lower back pain. The current standard of care in patients diagnosed with spondylosis in the lower back is to perform a radiofrequency ablation (RFA) of the lumbar medial branch nerves which carry the pain signals from that region to the brain. RFA accomplishes this by using radio waves transmitted through inserted electrodes. This leads to a temporary lesion or "burn"; stopping the pain signals from being transmitted as as well as changing the pain signals themselves. The electrodes themselves do not heat up but instead cause ions in the surrounding tissue to vibrate and heat up. When performing the procedure at the UAMS pain clinic, one can use the Stryker system with a single electrode end which protrudes out of the cannula or the Stratus Nimbus electrode with two prongs which expand in a "V"; formation along the sides of the cannula. While testing in chicken tissue shows that the latter electrode type produces a larger lesion size, anecdotal evidence suggests that it may lead to longer term pain relief. As such, the choice is currently left up to physician preference as both are FDA approved for use in this condition. This study is trying to assess if the larger lesion size results in a reduction in impairment of activities of daily living due to pain measured by the patient-reported PROMIS (Patient Reported Measurement Information System)-29 questionnaire. The PROMIS-29 is given to all patients who are seen in the UAMS Pain Clinic at initial and follow-up visits. In this study we would like to randomize what electrode and cannula set is used in RFA for patient's who are already going to be receiving the procedure for treatment for their spondylosis. The study team would then compare the PROMIS outcomes between cases that used the Stryker and Stratus Nimbus electrodes at 1,3,6,9 and 12 months. It is hypothesized that the Nimbus electrode will result in a greater reduction and improvement in PROMIS scores for a longer duration than the Stryker electrode.

Detailed Description

This study is a single center double-blinded prospective randomized clinical trial. Patients will be recruited from the pool of patients seen by the Principal Investigators (PIs) and collaborating physicians in the UAMS pain management clinic through the Department of Anesthesiology. Candidacy for RFA is determined by the standard of care which includes diagnosis of axial low back pain without lower extremity radiation or other primary pain generators. These patients should not have had previous RFA's in the lumbar region before. These patients should receive greater than 80% pain relief following two diagnostic MBBs completed at separate times. In routine care, physicians discuss with patients the risks and benefits associated with the RFA procedure. In order to establish a baseline level of pain, disability, and impairment of daily living, patients are routinely asked to complete the PROMIS-29 questionnaire to the best of their ability. Once patients receive their second MBB they are to return 2 to 4 weeks later for RFA should they meet the necessary 80% pain relief. At the time of the procedure, a simple randomization performed by a staff member not involved in the patient's care, will be used to determine if the patient's procedure will involve the use of the Stratus Nimbus or the Stryker Venom electrode and cannula set. The provider performing the procedure will be made aware of which electrode is to be used. However, patients will be blinded to the group to which they were randomized. Patients will continue with conventional RFA as per standard of care. Patients will then be contacted at 1,3,6, 9, and 12 months for assessment of response to intervention including the PROMIS-29 questionnaire. Scores are then compared to those taken at baseline to determine efficacy of treatment and inform future care.

Conditions

Lumbar Spondylosis

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

Stratus Nimbus

Patients will receive their radiofrequency ablation procedure of the lumbar medial branch nerves with the Stratus Nimbus Electrode.

Group Type: ACTIVE_COMPARATOR

Stratus Nimbus Electrosurgical RF Multi-Tined Expandable Electrode

Intervention Type: DEVICE

Radiofrequency Ablation of Lumbar Medial Branch Nerves using the Stratus Nimbus Electrode

Stryker Venom

Patients will receive their radiofrequency ablation procedure of the lumbar medial branch nerves with the Stryker Venom Cannula.

Group Type: ACTIVE_COMPARATOR

Stryker Venom Radiofrequency Cannula

Intervention Type: DEVICE

Radiofrequency Ablation of Lumbar Medial Branch Nerves using the Stryker Venom Cannula

Interventions

Stratus Nimbus Electrosurgical RF Multi-Tined Expandable Electrode

Radiofrequency Ablation of Lumbar Medial Branch Nerves using the Stratus Nimbus Electrode

Intervention Type: DEVICE

Stryker Venom Radiofrequency Cannula

Radiofrequency Ablation of Lumbar Medial Branch Nerves using the Stryker Venom Cannula

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

1. Greater than 18 years of age

2. Presenting with chronic non-radicular lower back pain

3. Failure of conservative treatment such as physical therapy or NSAID usage

4. Diagnosis of lumbar facet mediated lower back pain by a board-certified chronic pain physician via two sets of prognostic lumbar MBBs with 0.5cc of 0.5% bupivacaine with >80% pain relief

Exclusion Criteria

1. History of known coagulopathy

2. > 3 American Society of Anesthesiologists Classification

3. Pregnancy

4. Spinal hardware between L3 and S1

5. Allergies to injection medications

6. English illiteracy

7. Pain improvement following physical therapy or NSAID usage

8. Previous history of attempted lumbar RFA

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

University of Arkansas

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Jarna Shah, MD

Role: PRINCIPAL_INVESTIGATOR

University of Arkansas

Locations

University of Arkansas for Medical Sciences

Little Rock, Arkansas, United States

Site Status: RECRUITING

Countries

United States

Central Contacts

Jarna Shah, MD

Role: CONTACT

jshah2@uams.edu

6308648577

Edward E Denton, BS

Role: CONTACT

edenton@uams.edu

9018323377

Facility Contacts

Jarna Shah, MD

Role: primary

Jshah2@uams.edu

630-864-8577

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Other Identifiers

297420

Identifier Type: -

Identifier Source: org_study_id