BACKGROUND: Radiofrequency ablation (RFA) is widely used as an interventional treatment for chronic low back pain; however, its clinical effectiveness across different pain generators remains uncertain, particularly when evaluated in rigorously controlled trials.
OBJECTIVE: To systematically review randomized controlled trials assessing the effectiveness of RFA for chronic low back pain, stratified by pain generator and radiofrequency technique.
METHODS: A systematic search of PubMed, Embase, the Cochrane Library, and ClinicalTrials.gov was conducted to identify randomized controlled trials evaluating RFA for chronic low back pain. Trials employing sham or active comparator interventions were included. Study selection, data extraction, and risk of bias assessment were performed independently by two reviewers.
RESULTS: Six randomized controlled trials involving different pain generators were included. For discogenic low back pain, RFA of the ramus communicans did not demonstrate superiority over sham treatment, with pain reduction observed over time in both groups. Similarly, for facet joint pain, medial branch RFA was not superior to sham procedures within the studied follow-up period. For sacroiliac joint pain, results were heterogeneous. Sham-controlled trials evaluating conventional lateral branch RFA did not demonstrate a specific treatment effect, whereas studies employing alternative techniques, including strip-lesion, capsular, or cooled RFA, were associated with greater and more sustained pain reduction, with statistically significant between-group differences reported at up to 12 months in selected trials.
CONCLUSION: Based on a limited number of randomized controlled trials, RFA does not consistently demonstrate superiority over sham treatment for discogenic or facet joint-related chronic low back pain. For sacroiliac joint pain, selected RFA techniques may offer benefit in appropriately selected patients; however, conclusions remain constrained by heterogeneity and small sample sizes. Further high-quality, sham-controlled trials are required before definitive clinical recommendations can be made.
| Discipline Area | Score |
|---|---|
| Physician |  |
Physician rater
The value of radiofrequency ablation (RFA) heavily depends on the pain source and the technique employed. For discogenic and facet joint pain, the strong placebo responses observed in sham groups highlight that the procedural context itself provides significant pain relief, emphasising the importance of honest patient counselling. In cases of sacroiliac joint (SIJ) pain, advanced RFA techniques have demonstrated benefits, supporting their targeted use after conservative treatments and diagnostic blocks have failed. Key limitations include: only six RCTs meeting inclusion criteria, most with small sample sizes that limit the ability to detect modest effects; short follow-up periods (usually around 3 months); crossover design compromising long-term comparisons; diverse techniques and outcomes preventing meta-analysis; and a reliance on subjective pain assessments. Clinicians should wait for larger standardised trials.
Physician rater
Radiofrequency ablation (RFA) should be tailored based on the source of pain and the specific technique used, with careful patient selection. RFA does not consistently outperform a sham procedure in treating discogenic or facet joint chronic low back pain (CLBP), indicating that placebo effects might be influential. For sacroiliac joint (SIJ) pain, traditional lateral branch RFA showed no clear benefit, while alternative approaches such as strip-lesion, capsular, and cooled RFA provided statistically significant and longer-lasting pain relief for up to 12 months. Future research needs to focus on well-designed sham-controlled trials with standardized outcomes and extended follow-up, improved patient selection criteria, and comparison of different RFA techniques directly, particularly for SIJ pain.
, McMaster University