NCT07076810

The Relation of the Anatomic Morphology of Lumbar Transverse Processes and the Success Rate of Facet Joint Radiofrequency Denervation

Morphology of Lumbar Transverse Processes and Relationship With the Success of Lumbar Medial Branch Radiofrequency Ablation in Facet Syndrome

• Status: Not Yet Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 40 (estimated)
• Sponsor: Ondokuz Mayıs University · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Adult patients who were planned for lumbar facet joint medial branch nerve Radiofrequency ablation under fluoroscopic guidance because of facet joint-originated chronic lower back pain will be included in this study. Pain scores (Numerical Rating Scale and Oswestry Disability Index) will be recorded before and one month after the intervention. The morphology of the transverse processes and the facet joints (sizes and angles) will be evaluated using the computer tomography images that patients have in routine examination process. The possible relationship between the success rate of the procedure and the morphology of the transverse processes will be assessed by statistical analysis.

Detailed description

Our study will include patients who are examined at the Ondokuz Mayis University Algology Outpatient Clinic and diagnosed with chronic low back pain originating from the facet joints and deemed suitable for lumbar facet joint medial branch radiofrequency RF ablation (RFA) treatment. The study period will be between August 1, 2025, and June 30, 2026. Those who do not volunteer to participate in the study, those with significant anatomical deformities in the lumbar spine, those unable to answer the study questions, those with a history of lumbar vertebral surgery, and those who are or may be pregnant will be excluded. Patients' gender, age, body mass index, and the duration of pain will be recorded. Patients' pain intensity will be assessed using the Numerical Rating Scale (NRS) and the Oswestry Disability Index (ODI). The NRS asks patients to rate their pain intensity between 0 and 10. 0 represents no pain, and 10 represents the highest pain they can imagine. Patients' NRS scores and ODI scores at rest and during activity will be recorded before and 1 month after the RFA procedure. A 40% or greater reduction in ODI score will be defined as "significant benefit from the procedure." The angles of the superior articular and transverse processes at the bilateral L1/2, L2/3, L3/4, L4/5, and L5/S1 levels, as well as the angles of the facet joint in the axial plane, will be calculated from Lumbar Spine Computed Tomography images taken during the diagnosis and treatment processes. No additional imaging will be required for this study; the data will be obtained from the patients' previously obtained lumbar spine CT images. Patients will be divided into two groups for each level: "greater angle" and "lesser angle," based on the angles specified above. Post-procedure pain scores and the rate of significant benefit from the procedure will be compared. Patients will be evaluated one month after the procedure for pain scores and Oswestry Disability Index. Furthermore, a correlation will be investigated between the reduction in pain scores at each level and the specified angles. Statistical analyses of the study will be conducted using Statistical Package for Social Sciences (SPSS) version 26. Data obtained by counting will be expressed as numbers and percentages, and data obtained by measurement will be expressed as mean ± standard deviation. The Student t-test will be used for parameters showing normal distribution in comparisons of descriptive statistical methods and quantitative data, and the Mann-Whitney U test will be used for parameters not showing normal distribution. The chi-square test will be used for comparisons of qualitative data. The relationship between changes in pain scores and the anatomical angles evaluated in the study will be assessed using the Pearson Correlation Test. A P value of less than 0.05 will be considered statistically significant. This cross-sectional, observational study will not interfere with the patients' routine treatment protocols. Sample Size and Statistical Methods: Statistical analyses of the study will be conducted using SPSS (Statistical Package for Social Sciences) version 26. Data obtained by counting will be expressed as numbers and percentages, and data obtained by measurement will be expressed as mean ± standard deviation. The Student t-test will be used for normally distributed parameters when comparing descriptive statistical methods and quantitative data, and the Mann-Whitney U test will be used for non-normally distributed parameters. The chi-square test will be used for comparisons of qualitative data. The relationship between changes in pain scores and the anatomical angles evaluated in the study will be assessed using the Pearson Correlation Test. A P value of less than 0.05 will be considered statistically significant.

Conditions

• Lower Back Pain Chronic

Interventions

Type	Name	Description
PROCEDURE	Lumbar facet joints medial branch nerve radiofrequency ablation	Patients will be positioned prone on the operation table. Intravenous access is opened. Monitorization for vital signs is performed. Light sedation with midazolam is performed. Under fluoroscopic guidance, medial branch nerve of each lumbar facet joint is found by searching the specific response to the stimulations of the radiofrequency needle. When the tip of the radiofrequency needle is close enough to the corresponding medial branch nerve, ablation with 80 degrees Celsius for 90 seconds is performed. Average 6-10 nerves are ablated in each procedure and the average duration of the procedure is 20-60 minutes.
PROCEDURE	Lumbar facet joints medial branch nerve radiofrequency ablation	Patients are positioned prone on the operation table. Intravenous access is opened and monitorization of vital signs is applied. Skin is cleaned by povidone iodine solution. Light sedation is applied by midazolam. Lumbar vertebral region is seen under C-arm fluoroscopic view. Medial branch nerve of the lumbar facet joints is searched by 22 G width, 10-cm length radiofrequency needles. When the needle tip is close enough to the nerve, an 80 Celsius, 90-second radiofrequency ablation is applied. In each procedure, average 5-10 nerves is ablated and the duration of the procedure is 20-60 minutes.

Timeline

• Start date: 2025-09-01
• Primary completion: 2026-06-30
• Completion: 2026-06-30
• First posted: 2025-07-22
• Last updated: 2025-08-19

Locations

1 site across 1 country: Turkey (Türkiye)