Randomized control study that compares different concentrations of local anesthetic to investigate whether a lower concentration of local anesthetic would contribute to lower rebound pain scores at 24 hours post op in patients undergoing anatomic or reverse total shoulder arthroplasty.
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Max NRS Pain Score at 24 hours
Timeframe: 24 hours after intervention; will also be assessed at 48 and 72 hours, though these are not the primary outcome for the study.