Predictors of continued opioid use 6 months after total joint arthroplasty: a multi-site study

Continued opioid use after total knee and hip arthroplasty (TKA/THA) is well-documented and associated with both surgical and patient-reported factors. Research examining the combined effects of a multitude of factors on continued, and even chronic, opioid use in a systematic algorithmic manner is lacking. This study prospectively evaluated the combined effect of patient-related and surgical factors associated with continued opioid use after TKA/THA.

From 2016 to 2018, 198 participants undergoing TKA or THA were recruited from two tertiary care facilities. Participants completed surveys before surgery and at 2 weeks, 1, 3, and 6 months following surgery. A LASSO approach, followed by an exhaustive covariate selection procedure, was used to build a multivariable mixed-effects logistic regression model estimating the odds ratio of continued postoperative opioid use based on surgical factors and patient-reported factors.

Approximately half of the participants underwent either TKA (49%) or THA (51%). Preoperatively, 15% of participants reported taking opioid medication. Opioid use decreased from 68% at 2-week follow-up to 7% by 6 months. In addition, preoperative opioid use (95% CI 1.07-4.37), increased pain (95% CI 1.21-1.62), elevated preoperative Pain Catastrophizing Scale scores (95% CI 1.01-1.04), lower Physical Function scores (95% CI 0.87-0.95), and participants undergoing TKA, compared to THA, (95% CI 0.25-0.67) were found to be significantly associated with continued postoperative opioid use up to 6 months.

Preoperative opioid use, average pain, reduced physical function, and TKA were significantly associated with continued postoperative opioid use. Findings illustrate the need for preoperative and longitudinal assessment of patient-reported outcomes to mitigate poor postoperative pain outcomes.

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