Liposome Bupivacaine Interscalene Total Shoulder

This is a randomized prospective outcomes study comparing two groups of patients. One group will receive liposomal bupivacaine plus bupivacaine and the other will receive bupivacaine alone in interscalene blocks when undergoing total shoulder arthroplasty. The purpose of the study is to determine if LB plus bupivacaine provides superior pain control compared to bupivacaine alone when injected in an interscalene block for patients undergoing total shoulder arthroplasty surgery.