IRCT20190304042908N1 IRCT 2019-11-01 Shahid Beheshti University of Medical Sciences the Effect of Hyaluronidase and Lidocaine Injection on Pain Syndrome Comparison of the Effect of Hyaluronidase and Lidocaine Injection on Myofascial Pain Syndrome 2019-08-23 anticipated 24 Complete https://irct.ir/trial/41003 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Patients included in the study were divided into 2 groups by a random-number table. The research sample was determined using sampling method based on entry criteria and considering the possibility of destruction, 24 people .People are selected with easy sampling and are enrolled in the study.Then, they are divided into two groups of control and intervention by simple random sampling law. N/A Patients who experience chronic pain in the dorsal muscles.. Intervention 1: Intervention group: Hyaluronidase injection group. Hyaluronidase 3.2 ml (containing 1% hyaluronidase and 0.9% normal saline) are injected. Injection is performed on two painful points of trapezius muscle with ultrasound guidance for each patient and pressure is applied to prevent the bleeding of the injection site for two minutes. Intervention 2: Intervention group 2: Lidocaine injection group. The lidocaine group is injected with 2.3 ml (containing 1% lidocaine and 0.9% normal saline). The injection is performed on two painful points of the trapezius muscle with ultrasound guidance for each patient and is pressed for two minutes to prevent bleeding at the injection site. 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 study is completed, it will be decided