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Risk Factors for Venous Thromboembolism in Patients Undergoing Total Hip Replacement and Receiving Routine Thromboprophylaxis
A.B. Pedersen, MD, PhD1; H.T. Sorensen, MD, DMSc1; F. Mehnert, Dipl-Math1; S. Overgaard, MD, DMSc2; S.P. Johnsen, MD, PhD1
1 Department of Clinical Epidemiology, Aarhus University Hospital, Olof Palmes Alle 43-45, 8200 Aarhus N, Denmark. E-mail address for A.B. Pedersen: abp@dce.au.dk
2 Department of Orthopaedic Surgery, Clinical Institute, Odense University Hospital, Sdr. Boulevard 29, 5000 Odense, Denmark
View Disclosures and Other Information
Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, and the Department of Orthopaedic Surgery, Clinical Institute, Odense University Hospital, Odense, Denmark

Copyright © 2010 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2010 Sep 15;92(12):2156-2164. doi: 10.2106/JBJS.I.00882
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Abstract

Background: 

Data on the risk factors for venous thromboembolism among patients undergoing total hip replacement and receiving pharmacological thromboprophylaxis are limited. The purpose of this study was to examine potential patient-related risk factors for venous thromboembolism following total hip replacement in a nationwide follow-up study.

Methods: 

Using medical databases, we identified all patients who underwent primary total hip replacement and received pharmacological thromboprophylaxis in Denmark from 1995 to 2006. The outcome measure was hospitalization with venous thromboembolism within ninety days of surgery. We considered age, sex, indication for primary total hip replacement, calendar year of surgery, and comorbidity history as potential risk factors.

Results: 

The overall rate of hospitalization for venous thromboembolism within ninety days following a primary total hip replacement was 1.02% (686 hospitalizations after 67,469 procedures) at a median of twenty-two days. The incidence of symptomatic deep venous thrombosis and of nonfatal pulmonary embolism was 0.7% (499 of 67,469) and 0.3% (205 of 67,469), respectively. The incidence of death due to venous thromboembolism or from all causes was 0.05% (thirty-eight patients) and 1.0% (678 patients), respectively. Patients with rheumatoid arthritis had a reduced relative risk for venous thromboembolism compared with patients with primary osteoarthritis (adjusted relative risk = 0.47; 95% confidence interval, 0.25 to 0.90). Patients with a high score on the Charlson comorbidity index had an increased relative risk for venous thromboembolism compared with patients with a low score (adjusted relative risk = 1.45; 95% confidence interval, 1.02 to 2.05). Patients with a history of cardiovascular disease (relative risk = 1.40; 95% confidence interval, 1.15 to 1.70) or prior venous thromboembolism (relative risk = 8.09; 95% confidence interval, 6.07 to 10.77) had an increased risk for venous thromboembolism compared with patients without that history.

Conclusions: 

The cumulative incidence of a venous thromboembolism within ninety days of surgery among patients with total hip replacement receiving pharmacological thromboprophylaxis was 1%. This information on the associated risk factors could be used to better anticipate the risk of venous thromboembolism for an individual patient.

Level of Evidence: 

Prognostic Level II. See Instructions to Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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