Comparison of Upper Trapezius and Infraspinatus Myofascial Trigger Point Therapy by Dry Needling in Overhead Athletes With Unilateral Shoulder Impingement Syndrome

40 overhead sport athletes with pain from shoulder impingement syndrome were randomized to receive dry needling (DN) of myofascial trigger points directly into the upper trapezius muscle, or indirect DN into the infraspinatus muscle. Outcomes of interest included VAS pain score, DASH score, and pressure pain threshold; follow up was performed 3 days after the completion of treatment. Results from the study found no significant differences between groups in all outcomes.