Real-world practices to prevent venous thromboembolism with pharmacological prophylaxis in US orthopedic surgery patients: an analysis of an integrated healthcare database.

Major orthopedic surgery patients are at high risk of venous thromboembolism (VTE) in-hospital and post-discharge. This study assessed real-world inpatient and outpatient thromboprophylaxis practices following knee or hip arthroplasty. Patients from the Henry Ford Health System aged ≥18 years undergoing knee and hip arthroplasty (January 1997-June 2007) were identified using Current Procedural Terminology codes from administrative databases. Patients with <18 months of continuous enrollment in the system's health maintenance organization or with a current diagnosis of atrial fibrillation were excluded. Both inpatient and outpatient pharmacological prophylaxis was assessed. The analysis included 1393 (58.5%) patients following knee arthroplasty and 989 (41.5%) following hip arthroplasty. Average length of hospitalization was 4.9 days over the study period, although the median stay decreased from 5 days in 1997 to 3 days in 2007. Of patients included, 72.7% received pharmacological prophylaxis only in the inpatient setting following knee arthroplasty and 73.9% following hip arthroplasty. Both inpatient and outpatient pharmacological prophylaxis was received by 12.5% of knee and 12.3% of hip arthroplasty patients. Total length of pharmacological prophylaxis fluctuated between 2 to 4 days between 1997 and 2005, but increased to 11.5 ± 9.0 days in 2007. Although the duration of prophylaxis has recently increased, considerable numbers of hip and knee arthroplasty patients only receive prophylaxis for part of the time period recommended by guidelines. Further efforts are required to ensure the recommended duration of thromboprophylaxis is prescribed to all patients and continued outpatient VTE prophylaxis is provided.