Patterns of pre-operative opioid use affect the risk for complications after total joint replacement

Background: Preoperative opioid use has been shown to increase the risk for complications following total joint arthroplasty (TJA); however, these studies have not always accounted for differences in co-morbidities and socio-demographics between patients that use opioids and those that do not. They have also not accounted for the variation in degree of pre-operative use. The objective of this study was to determine if preoperative opioid use is associated with risk for surgical complications after TJA, and if this association varied by degree of use. Methods: Population-based retrospective cohort study. Older adult patients undergoing primary TJA of the hip, knee and shoulder for osteoarthritis between 2002 and 2015 in Ontario, Canada were identified. Using accepted definitions, patients were stratified into three groups according to their preoperative opioid use: no use, intermittent use and chronic use. The primary outcome was the occurrence of a composite surgical complication (surgical site infection, dislocation, revision arthroplasty) or death within a year of surgery. Intermittent and chronic users were matched separately to non-users in a 1:1 ratio, matching on TJA type plus a propensity score incorporating patient and provider factors. Results: Overall, 108,067 patients were included in the study; 10% (N=10,441) used opioids on a chronic basis before surgery and 35% (N=37,668) used them intermittently. After matching, neither intermittent nor chronic pre-operative opioid use were associated with an increased risk for complications after TJA. Conclusions: Overall, less than half of patients undergoing TJA used opioids in the year preceding surgery; the majority used them only intermittently. Pre-operative opioid use is not associated with an increased risk for complications after TJA.