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Clinical Orthopaedics and Related Research®
Published in: Clinical Orthopaedics and Related Research® 9/2010

01-09-2010 | Clinical Research

Nonadherence in Outpatient Thrombosis Prophylaxis with Low Molecular Weight Heparins after Major Orthopaedic Surgery

Authors: Thomas Wilke, PhD, Jörn Moock, PhD, Sabrina Müller, BSc, Matthias Pfannkuche, PhD, Andreas Kurth, PhD

Published in: Clinical Orthopaedics and Related Research® | Issue 9/2010

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Abstract

Background

According to some current guidelines, extended thromboprophylaxis after hip and knee arthroplasties is recommended. Outpatient prophylaxis with low molecular weight heparins (LMWH) is an important part of this prophylaxis, although the rates of adherence to these regimens is not known.

Questions/purposes

We determined (1) the degree of nonadherence (NA) of patients with LMWH outpatient prophylaxis, and (2) whether specific independent factors explain NA.

Methods

NA was determined by syringe count and by indirect and direct questions to patients. We defined six different NA indicators. To identify factors explaining LMWH NA, we used three different logistic regression models.

Results

NA rates ranged between 13% and 21% depending on the indicator used for measurement. Patients who were nonadherent missed between 38% and 53% of their outpatient LMWH injections. If patients attended an outpatient rehabilitation program, the probability for their NA increased substantially. Moreover, the NA probability increased with each additional day between acute hospitalization and start of rehabilitation (linking days). NA was lower for patients who feared thrombosis or who believed antithrombotic drugs to be the most important measure in thromboprophylaxis.

Level of Evidence

Level II, prognostic study. See the Guidelines for Authors for a complete description of levels of evidence.
Appendix
Available only for authorised users
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Metadata
Title
Nonadherence in Outpatient Thrombosis Prophylaxis with Low Molecular Weight Heparins after Major Orthopaedic Surgery
Authors
Thomas Wilke, PhD
Jörn Moock, PhD
Sabrina Müller, BSc
Matthias Pfannkuche, PhD
Andreas Kurth, PhD
Publication date
01-09-2010
Publisher
Springer-Verlag
Published in
Clinical Orthopaedics and Related Research® / Issue 9/2010
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI
https://doi.org/10.1007/s11999-010-1306-8

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