Multimodal pain management and postoperative outcomes in inpatient and outpatient shoulder arthroplasties: a population-based study.

Introduction: Multimodal analgesia has been associated with reduced opioid utilization, opioid-related complications, and improved recovery in various orthopedic surgeries; however, large sample size data is lacking for shoulder surgery.

Methods: A retrospective review using the Premier Healthcare Database of patients who underwent inpatient or outpatient (reverse, total, partial) shoulder arthroplasty from 2010 to 2019. Opioid-only analgesia was compared with multimodal analgesia, categorized into 1, 2, or >2 additional analgesic modes, with/without a nerve block. Multivariable regression models measured associations between multimodal analgesia and opioid charges (in oral morphine equivalents (OME)), cost and length of stay, and opioid-related adverse effects (approximated by naloxone use). We report % change and 95% CIs.

Results: Among 176 225 procedures, 169 679 (75.7% multimodal analgesia use) and 6546 (37.8% multimodal analgesia use) were inpatient and outpatient shoulder arthroplasties, respectively. Among inpatients, multimodal analgesia (>2 modes) without a nerve block (vs opioid-only analgesia) was associated with adjusted reductions in OMEs on postoperative day 1: -19.4% (95% CI -21.2% to -17.6%/representing unadjusted median OME reductions from 45 to 30 mg). For total hospitalization, this was -6.0% (95% CI -7.2% to -4.9%/representing unadjusted median OME reductions from 173 to 135 mg). Conversely, for outpatients, this was +13.7% change in OMEs (95% CI +4.4% to +23.0%/representing unadjusted median OME increases from 110 to 131 mg). In both settings, addition of a nerve block to multimodal analgesia attenuated effects in terms of opioid charges.

Conclusions: Multimodal analgesia is associated with reductions in opioid charges-specifically inpatient setting-but not various other outcomes.