Introduction: Multiple studies have demonstrated that patients taking opioids in the preoperative period are at elevated risk for complications following total hip (THA) and knee (TKA) arthroplasty. However, the incidence and impact of opioid use disorder (OUD) among these patients-both clinically and fiscally-remain unknown. The purpose of this study was to investigate this relationship.
Methods: The Nationwide Readmission Database (NRD) was used to identify patients undergoing THA and TKA from 2011 to 2015. Coarsened exact matching was used to statistically match the OUD and non-OUD cohorts. Further analysis was then conducted on matched cohorts with multivariate analysis. The incidence of OUD was also determined, and the costs associated with this comorbidity were calculated.
Results: The incidence of OUD in arthroplasty patients increased 80% over the study period. OUD patients had higher odds of prosthetic joint infection (OR 1.55, 95% CI 1.23-1.94), wound complication (OR 1.40, 95% CI 1.12-1.76), prosthetic complication (OR 1.37, 95% CI 1.10-1.70), and revision surgery (OR 1.47, 95% CI 1.19-1.81). OUD patients also had longer length of stays (TKA: +0.67 days; THA: +1.09 days), higher readmission (OR 1.60, 95% CI 1.43-1.79), and increased 90-day costs (TKA: +$3,602 [95% CI $3,138-4,065]; THA: +4,527 [95% CI $3,593-4,920).
Conclusion: Opioid use disorder is becoming a more common comorbidity among THA and TKA patients. This is concerning as it represents a significant risk factor for postoperative complication. It additionally confers increased perioperative costs. Patients with OUD should be counseled on their elevated risk, and future work will be needed to determine if this is a modifiable risk factor.
Copyright © 2019 Jacob M. Wilson et al.