Objective: To compare rates of post-operative VTE between patients who received aspirin-only versus anticoagulants after hip or knee arthroplasty, using data from a large US-based administrative database.
Methods: We identified 231,780 adults who underwent total knee arthroplasty and 110,621 who underwent total hip arthroplasty in 2009-2012 and who received pharmacologic VTE prophylaxis (aspirin or anticoagulant) within the first 7 days after surgery. We compared the risk of post-operative VTE between patients receiving aspirin-only vs. anticoagulants, controlling for clinical and hospital characteristics using multivariable logistic regression with propensity score adjustment.
Results: Aspirin-only prophylaxis was administered to 7.5% of patients after knee arthroplasty and 8.0% after hip arthroplasty. Post-operative VTE was diagnosed in 2,217 (0.96%) patients after knee arthroplasty and 454 (0.41%) after hip arthroplasty. Compared to anticoagulants, aspirin was not associated with a higher risk for post-operative VTE either after knee arthroplasty (adjusted odds ratio and 95% confidence interval [OR] 0.34 [0.24-0.48]) or hip arthroplasty (OR 0.82 [0.45-1.51]).
Conclusions: Aspirin was not commonly administered as the sole prophylactic agent after hip or knee arthroplasty in this study. Patients who received aspirin-only did not have higher rates of post-operative VTE than patients who received anticoagulants. This study supports the use of aspirin in selected patients undergoing arthroplasty.
To cite this abstract:Chu, JN; Auerbach, AD; Maselli, J; Fang, MC . THE RISK OF VENOUS THROMBOEMBOLISM WITH ASPIRIN COMPARED TO ANTICOAGULANTS AFTER HIP OR KNEE ARTHROPLASTY. Abstract published at Hospital Medicine 2017, May 1-4, 2017; Las Vegas, Nev. Abstract 72. Journal of Hospital Medicine. 2017; 12 (suppl 2). https://www.shmabstracts.com/abstract/the-risk-of-venous-thromboembolism-with-aspirin-compared-to-anticoagulants-after-hip-or-knee-arthroplasty/. Accessed September 16, 2019.