Comparison of surgery and local steroid injections for the treatment of carpal tunnel syndrome: A randomized controlled trial

Background: There is no consensus about the optimum treatment or treatment algorithm for carpal tunnel syndrome (CTS). In previous randomized studies that compared open carpal tunnel release and local steroid injections (LSIs), the two most used nonconservative treatments, conflicting results were found. Objective: The objective of the study was to compare the efficacies of surgery and LSI in the treatment of CTS. Subjects and Methods: A randomized, controlled clinical trial was conducted with 80 patients who were clinically diagnosed as having idiopathic CTS. The requirements for enrollment were awakening from sleep due to nocturnal paresthesia and a diagnosis to be confirmed through electrodiagnostic tests. Patients were randomly assigned to the surgery and the steroid groups. Assessments were performed at baseline and 1, 3, 6, and 12 months after initial treatment. The primary outcome measure was the improvement of awakening from sleep. Results: A total of 80 patients were enrolled in the study. Thirty-six patients were assigned to the surgery group and 44 to the steroid group. None of our patients were lost to follow-up. Fourteen out of the 44 patients in the steroid group and all 36 patients in the surgery group had a successful outcome at the 12-month assessment. Success rates in the steroid group at 1, 3, 6, and 12 months were 77.3%, 61.4%, 45.5%, and 31.8%, respectively. When the injection group was evaluated separately, LSI was found more successful in mild cases and unilateral cases. Conclusion: Surgery should be chosen for the treatment of moderate-to-severe idiopathic CTS, but LSI may be used for mild cases. The historical-objective scale may predict which patient will benefit from which treatment.