Effect of Interscalene Block Methods on Rebound Pain

The block needle will be advanced from the middle scalene muscle in a posterior-anterior direction and advanced between the C5-C6 nerve roots and the injection will be performed

The block needle will first be advanced above the C5 nerve root and towards the anterior part of the brachial plexus and 10 ml of local anesthetic will be injected. Then, the needle will be withdrawn to the posterior surface of the brachial plexus and 10 ml of local anesthetic will be administered.