Inclusion Criteria:  Undergoing shoulder surgery Having signed a written informed consent form, ASAI-III  Exclusion Criteria:  Inadequate indication for interscalene block (Coagulation disorder, local infection of block site, Diaphragmatic paralysis, Allergy to local anesthetics) Neuropathic disorder Severe cardiopulmonary disease Systemic steroid use Chronic opioids use Stomach ulcer Ucontrolled Diabetes Psychiatric disorders, Pregnancy, Severe obesity (body mass index > 35 kg/m2)