IRCT20190409043210N1 IRCT 2020-01-11 Shiraz University of Medical Sciences Dry needling of shoulder pain Comparison of the effect of the two different methods of dry needling in patients with shoulder impingement syndrome 2020-02-04 anticipated 66 Complete https://irct.ir/trial/38752 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The way to assigning people to 3 groups based on the Permuted block randomization (6 people in every block) is according to Random Allocation software, Blinding description: All stages of measurement and treatment will be performed by two researchers. The process of classification and treatment of patients will be performed by the first researcher. The second researcher will not be informed about the classification and interventions of patients and Will only collaborate on patient evaluation. Therefore, the blindness of the assessor will be performed. N/A Shoulder impingement syndrome. Intervention 1: First intervention group: Ten consecutive sessions of routine physical therapy for shoulder, including exercise and interferential therapy with hot pack and three sessions of deep dry needling for Infraspinatus muscle in the third, fifth and seventh session of the main therapy course. Intervention 2: second intervention group: Ten consecutive sessions of routine physical therapy for shoulder, including exercise and interferential therapy with hot pack and three sessions of dry needling by Hong method for Infraspinatus muscle in the third, fifth and seventh session of the main therapy course. Intervention 3: Control group: Ten consecutive sessions of routine physical therapy for shoulder, including exercise and interferential therapy with hot pack. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is After the end of the research, it will be decided by the researchers as to its publication.