Comparison Between Effectiveness of Ultrasound-Guided Corticosteroid Injection Above Versus Below the Median Nerve in Mild to Moderate Carpal Tunnel Syndrome: A Randomized Controlled Trial

Objective In this study, the clinical effectiveness of ultrasound-guided corticosteroid injection "above" versus "below" the median nerve for treatment of patients with mild to moderate carpal tunnel syndrome was compared. Design This prospective randomized double-blind clinical trial included 44 patients with mild to moderate carpal tunnel syndrome. The subjects were randomly assigned to two groups to receive ultrasound-guided injection of 40 mg of triamcinolone either "above" or "below" the involved median nerve. Outcome measures were the Boston Carpal Tunnel Questionnaire, visual analog scale, electrophysiological tests, and ultrasonographic measurement of the median nerve cross-sectional area at baseline, 6, and 12 wks after the injection. Results All outcome measures improved significantly in both groups at 6 wks after intervention, and these improvements were persevered up to 12 wks of follow-up (all P values

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