Transforaminal Epidural Steroid Injections for Treating Lumbosacral Radicular Pain from Herniated Intervertebral Discs: A Systematic Review and Meta-Analysis

BACKGROUND: Steroids often are administered into the epidural space through the transforaminal epidural (TFE) route to treat lumbosacral radicular pain secondary to herniated intervertebral discs. However, their efficacy and safety compared with transforaminal epidural local anesthetics (LAs) or saline injections is unclear. METHODS: We reviewed randomized controlled trials that compared TFE injections of steroids (with or without LA) with LA or saline in adult outpatients with lumbosacral radicular pain secondary to herniated intervertebral disks. Databases searched included MEDLINE, EMBASE, Cochrane central register of controlled trials, Cochrane database of systematic reviews, and Google Scholar up to February 2015. Data on scores of numerical rating scale for pain, validated scores for measuring physical disability and quality of life, and incidence of surgery measured at 1 month to 2 years after the interventions were meta-analyzed. Strength of evidence was classified with the Grading of Recommendations Assessment, Development and Evaluation (GRADE) system. RESULTS: Eight randomized controlled trials including 771 patients (366 in steroid and 405 in comparator groups) were included. There was variability in the studies in the dose of TFE steroids, frequency, and number of procedures. Patients who received TFE steroids reported a significant, but clinically modest, reduction in mean pain scores (0–10 scale) compared with LA/saline (−0.97 points; 95% confidence interval, −1.42 to −0.51 points; P

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