Low-level laser therapy in subacromial impingement syndrome

Although previous studies have evaluated the effect of different kinds of physical therapy in subacromial impingement syndrome (SIS), there have been few investigations assessing the effectiveness of low-level laser therapy (LLLT) in shoulder disorders. The goal of this prospective randomized study was to assess whether gallium-arsenide (Ga-As) laser therapy improves the outcome of a comprehensive home exercise program in patients with SIS.

Forty-four newly-diagnosed SIS patients were enrolled in this study. Group 1 patients (n = 22) received Ga-As laser therapy combined with a 12-wk comprehensive home exercise program, and group 2 patients (n = 22) received the same 12-wk comprehensive home exercise program alone. Night pain, shoulder pain and disability index (SPADI), and University of California-Los Angeles end-result (UCLA) scores were used as outcome measures.

Both groups showed a significant reduction in night pain and SPADI scores at the second and 12th weeks with respect to baseline values, with the exception of the SPADI total score at the second week in group 1. UCLA results improved significantly in both groups at the 12th in comparison to the second week. There were no significant differences between groups in mean actual changes in night pain and SPADI scores at the second week from baseline. When values at the 12th week were compared to baseline, mean actual changes in night pain differed significantly between the groups, with a larger change in group 1, but there was no difference between groups in mean actual change in SPADI scores. Second- and 12th-week UCLA scores did not differ between the two groups.

Our study was unable to demonstrate any distinct advantage of low-level laser therapy over exercise alone. Comprehensive home exercise programs should be the primary therapeutic option in the rehabilitation process in SIS.