Predictors and Characteristics of Opioid Utilization >15 Days Following Total Knee Arthroplasty.

Background: America is amid an opioid epidemic, best characterized by liberal prescribing practices; widespread opioid misuse, abuse, and diversion; and rising rates of prescription-related opioid overdose. While many contributors to opioid overprescribing exist, orthopedic surgery is identified as a key driver. The purpose of this study is to determine predictors of ongoing opioid use >15 days post-total knee arthroplasty (TKA) and those patients prescribed >1350 morphine milligram equivalents (MMEs) in the 15 days following surgery.

Methods: A retrospective cohort study was conducted in patients undergoing TKA (January 2016-December 2017) in an integrated healthcare system. Outcomes of interest were patient and clinical characteristics.

Results: A total of 621 patients were included in the study. The majority were female (57.6%), were non-Hispanic/Latino white (92.3%), and from metropolitan areas (64.3%) with fewer than 110,000 population. Mean age was 66.3. Being female (odds ratio [OR] = 1.547, P = .092), having a higher body mass index (OR = 1.043, P = .036), and receipt of more postdischarge prescriptions in the 60-day follow-up period (OR = 8.815, P < .0001) were associated with a greater likelihood of receipt of opioid prescriptions for more than 15 days. Older patients (OR = 0.954, P = .01) and those discharged to home (OR = 0.478, P = .045) were less likely to receive >1350 MME; longer length of stay (OR = 1.447, P = .013) was more likely in those prescribed >1350 MMEs.

Conclusion: Several predictors were associated with longer duration and higher doses of opioid prescriptions post-TKA. Further research is needed to ascertain the challenges of opioid prescribing from both the metropolitan surgical team and rural healthcare provider perspective.