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A Risk Calculator Using Preoperative Opioids for Prediction of Total Knee Revision Arthroplasty

Starr, Jordan MD; Rozet, Irene MD; Ben-Ari, Alon MD
The Clinical Journal of Pain: Post Acceptance: September 14, 2017
doi: 10.1097/AJP.0000000000000544
Original Article: PDF Only

Objectives:

Total knee arthroplasty (TKA) is a procedure to improve quality of life. However, some patients require early total knee revision (TKR). Chronic opioid use before TKA is associated with TKR. No risk calculator including opioid use or other risk factors is currently available for predicting TKR.

Materials and Methods:

We retrospectively analyzed medical records of Veterans Affairs patients who underwent TKA from January 1, 2006 to January 1, 2012. Patients were followed until January 1, 2013. Chronic opioid use was defined as opioid use for ≥3 months preoperatively. A cross-validated Cox proportional hazards model was created to predict TKR before initial TKA. Model performance was evaluated by the mean absolute error at 1 and 5 years.

Results:

Totally, 32,297 patients were included. A risk calculator was generated with a mean absolute error of 0.1% at 1 year and 3.6% at 5 years. Chronic opioid use was a significant predictor of TKR (hazard ratio [HR], 1.27; 95% confidence interval, 1.13-1.43; P<0.001). Other model variables were age (HR, 0.95; P<0.001), female sex (HR, 0.77; P=0.020), body mass index (HR, 0.99; P=0.022), diabetes (HR, 1.20; P=0.001), chronic kidney disease (HR, 1.48; P<0.001), and nonchronic opioid use (HR, 1.07; P=0.313).

Discussion:

Preoperative chronic opioid use is a predictor of TKR. Using this association and others, a TKA revision risk calculator was generated at http://www.bit.do/tka.

The authors declare no conflict of interest.

Reprints: Jordan Starr, MD, Department of Anesthesiology and Pain Medicine, University of Washington, 1959 NE Pacific Street, BB-1469, Seattle, WA 98195-6540 (e-mail: starrj@uw.edu).

Received April 30, 2017

Received in revised form July 6, 2017

Accepted August 6, 2017

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