Sonographic Median Nerve Change after Steroid Injection for Carpal Tunnel Syndrome.

Introduction: The sonographic changes of the median nerve after steroid injection for carpal tunnel syndrome (CTS) still require investigation. Methods: Sixty-two patients with CTS were included. The Boston Carpal Tunnel Questionnaire was administered, and ultrasonographic examinations were performed before and at 2, 6, and 12 weeks after steroid injection. At 12 weeks, general improvement was scored on a 6-point Likert scale. Results: After treatment, the cross-sectional area (CSA) of the median nerve was significantly reduced at 2-, 6-, and 12-week follow-ups (for each, P<0.001, analysis of variance). The significant improvement group (n=39) had a significantly greater reduction in the CSA at the carpal tunnel inlet (P=0.014) and CSA in the proximal carpal tunnel (P=0.003) compared with the little/no improvement group (n=23). Discussion: Sonographic measurement of CSA may be considered complementary to the standard clinical evaluation in monitoring of treatment response in patients with CTS. Muscle Nerve58: 402-406, 2018