Epidural steroid compared to placebo injection in sciatica: a systematic review and meta-analysis

Area of Science:

• Pain Management
• Interventional Pain Medicine
• Evidence-Based Medicine

Background:

• Sciatica is a common condition causing leg pain and disability.
• Epidural steroid injections (ESI) are frequently used to manage sciatica symptoms.
• The comparative effectiveness of ESI versus placebo requires rigorous evaluation.

Purpose of the Study:

• To systematically review and meta-analyze the efficacy of epidural steroid injections (ESI) compared to epidural or non-epidural placebo in sciatica patients.
• To assess the impact of ESI on leg pain, back pain, and functional status at various follow-up intervals.
• To evaluate the quality of evidence and safety of ESI for sciatica.

Main Methods:

• A systematic search of PubMed, Embase, Cochrane Library, and Web of Science databases was conducted.
• Seventeen randomized controlled trials comparing ESI to placebo were included in the meta-analysis.
• Risk of bias was assessed using the Cochrane RoB 2 tool, and evidence quality was graded using GRADE classification.

Main Results:

• ESI demonstrated superiority over epidural placebo for leg pain at 6 weeks and 3 months, and for functional status at 6 weeks.
• Minimally clinically important differences (MCID) were not consistently met for the primary outcomes.
• No significant differences were observed for back pain, except in one comparison, and treatment success proportions were similar between groups. Complication rates were low.

Conclusions:

• Epidural steroid injections offer short-term improvements in pain and disability for sciatica compared to epidural placebo, but the evidence quality is low to moderate.
• Conclusions regarding longer-term effects or comparisons with non-epidural placebo are limited by low evidence quality and study numbers.
• Epidural injections are considered a safe therapeutic option for sciatica management.