Intradiscal Glucocorticoid Injection for Patients With Chronic Low Back Pain Associated With Active Discopathy: A Randomized Trial.

Background Active discopathy is associated with a specific phenotype of chronic low back pain (LBP). Local inflammation has a role in active discopathy-associated symptoms. Objective To assess the efficacy of a single glucocorticoid intradiscal injection (GC IDI) in patients with chronic LBP with active discopathy. Design Prospective, parallel-group, double-blind, randomized, controlled study. (ClinicalTrials.gov: NCT00804531). Setting 3 tertiary care centers in France. Patients 135 patients with chronic LBP with active discopathy on magnetic resonance imaging (MRI). Intervention A single GC IDI (25 mg prednisolone acetate) during discography (n = 67) or discography alone (n = 68). Measurements The primary outcome was the percentage of patients with LBP intensity less than 40 on an 11-point numerical rating scale (0 [no pain] to 100 [maximum pain] in 10-point increments) in the previous 48 hours at 1 month after the intervention. The main secondary outcomes were LBP intensity and persistent active discopathy on MRI at 12 months and spine-specific limitations in activities, health-related quality of life, anxiety and depression, employment status, and use of analgesics and nonsteroidal anti-inflammatory drugs at 1 and 12 months. Results All randomly assigned patients were included in the primary efficacy analysis. At 1 month after the intervention, the percentage of responders (LBP intensity <40) was higher in the GC IDI group (36 of 65 [55.4%]) than the control group (21 of 63 [33.3%]) (absolute risk difference, 22.1 percentage points [95% CI, 5.5 to 38.7 percentage points]; P = 0.009). The groups did not differ in LBP intensity at 12 months and in most secondary outcomes at 1 and 12 months. Limitation Tertiary care setting. Conclusion In chronic LBP associated with active discopathy, a single GC IDI reduces LBP at 1 month but not at 12 months. Primary Funding Source French Ministry of Health.