Corticosteroid Versus Dextrose Ultrasound-Guided Injection in the Treatment of Sacroiliac Joint Dysfunction: A Randomized Double-Blinded Clinical Trial

Background: Sacroiliac Joint (SIJ) dysfunction, a common etiology of Low Back Pain (LBP), is a challenging diagnosis. There is controversy over the efficacy of prolotherapy and corticosteroid injections in relieving SIJ dysfunction. Inconsistent success rates reported in previous studies can be due to heterogeneity in selecting the patients and procedures between studies. This study was conducted to compare the efficacy of local injection of dextrose prolotherapy and corticosteroid in treating the SIJ dysfunction. 
Methods: This 36-week, double-blind, Randomized Controlled Trial (RCT) included 40 patients with SIJ dysfunction. The clinical impression was confirmed by the use of a diagnostic injection of local anesthetic inside SIJ. Participants received a single injection of either hypertonic dextrose solution or triamcinolone under Ultrasound (US) guidance. The primary outcome measurement tools, including the Visual Analog Scale (VAS) for pain and the Dallas Pain Questionnaire (DPQ), were evaluated initially and after 2, 8, and 36 weeks. 
Results: In both prolotherapy and corticosteroid groups, VAS significantly declined within 36-weeks of follow-up. However, there was no remarkable difference between the two groups at any follow-up timepoints. Similarly, DPQ revealed a remarkable improvement in the corticosteroid group while it did not show any meaningful change in the prolotherapy group. 
Conclusion: Both local injections of dextrose and corticosteroids can successfully reduce pain in patients with SIJ dysfunction without significant superiority between the two treatments. However, corticosteroid injection was slightly more effective in terms of improvement of functional status. Further investigations are required to extend these results to SIJ dysfunction treatment more reliably.