Effects on Postoperative Pain of Liposomal Bupivacaine in Interscalene Blocks for Total Shoulder Arthroplasty Patients

Subjects randomized to the Liposomal bupivacaine group will receive 10 mL (133 mg) of Liposomal bupivacaine and 20 mL (50 mg) of 0.25% bupivacaine and 6 mL of saline (183 mg).

Subjects randomized to the Plain Bupivacaine group will receive 36 mL (180 mg) of 0.5% bupivacaine.