Comparison of the Effectiveness of Dry Needling Versus the Combination of Dry Needling and Local Anesthetic Injection in Myofascial Pain Syndrome of the Upper Trapezius Muscle: A Sham-Controlled, Randomized Clinical Trial

This study was designed to compare the effectiveness of three different treatment protocols in patients diagnosed with myofascial pain syndrome of the upper trapezius muscle. A total of 90 volunteers aged between 18 and 65 years, with active trigger points identified in the upper trapezius muscle, will be included in the study. Participants will be randomly assigned to three groups: * Group 1: Dry needling and stretching exercises * Group 2: Dry needling following local anesthetic injection with 1% lidocaine and stretching exercises * Group 3 (Control): Sham dry needling following local anesthetic injection with 1% lidocaine and stretching exercises In all groups, treatment sessions will be administered at weeks 0, 1, 2, and 3; and participants will undergo clinical assessments at baseline (pre-treatment), at the end of treatment, one month after treatment completion, and three months after treatment completion. The primary outcome will be pain severity, measured using the Numeric Pain Rating Scale (NRS); secondary outcomes will include functional status evaluated with the Neck Pain and Disability Scale (NPADS) and QuickDASH, and muscle tenderness assessed by pressure pain threshold (PPT) measurement. The findings are expected to contribute scientifically to clinical practice by identifying the most effective treatment combination for managing upper trapezius myofascial pain syndrome.