Comparative study for the postoperative analgesic efficacy of 20 mL at 0.5, 0.75, and 1% ropivacaine in posterior brachial plexus block.

Background And Objectives: Arthroscopic shoulder surgeries are associated with severe postoperative pain. Among the analgesic techniques available, brachial plexus block has the best results. The objective of this study was to determine which concentration of local analgesic used in the posterior brachial plexus block provides longer postoperative analgesia.