Volume 27, Issue 8 pp. 1008-1015
Research Article
Free Access

Efficacy of colistin-impregnated beads to prevent multidrug-resistant A. baumannii implant-associated osteomyelitis

Daniel P. Crane

Daniel P. Crane

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

Disclaimer: The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or reflecting the views of the Department of the Army, Department of Defense, or the US government. This work was prepared as part of their official duties.

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Kirill Gromov

Kirill Gromov

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

The Department of Orthopedics, Aarhus University Hospital, Aarhus, Denmark

These authors contributed equally to this work.

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Dan Li

Dan Li

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

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Kjeld Søballe

Kjeld Søballe

The Department of Orthopedics, Aarhus University Hospital, Aarhus, Denmark

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Christian Wahnes

Christian Wahnes

Research & Development, Heraeus Medical GmbH, Wehrheim, Germany

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Hubert Büchner

Hubert Büchner

Research & Development, Heraeus Medical GmbH, Wehrheim, Germany

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Matthew J. Hilton

Matthew J. Hilton

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

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Regis J. O'Keefe

Regis J. O'Keefe

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

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Clinton K. Murray

Clinton K. Murray

Infectious Disease Service, Department of Medicine, Brooke Army Medical Center, Fort Sam Houston, San Antonio, Texas

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Edward M. Schwarz

Corresponding Author

Edward M. Schwarz

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642

The Center for Musculoskeletal Research, University of Rochester Medical Center, 601 Elmwood Avenue, Box 665, Rochester, New York 14642. T: 585-275-3063; F: 585-756-4727.Search for more papers by this author
First published: 27 January 2009
Citations: 33

This article is a US Government work and, as such, is in the public domain in the United States of America.

Abstract

Osteomyelitis (OM) from multidrug-resistant (MDR) Acinetobacter has emerged in >30% of combat-related injuries in Iraq and Afghanistan. While most of these strains are sensitive to colistin, the drug is not availible in bone void fillers for local high-dose delivery. To address this, we developed a mouse model with MDR strains isolated from wounded military personnel. In contrast to S. aureus OM, which is osteolytic and characterized by biofilm in necrotic bone, A. baumannii OM results in blastic lesions that do not contain apparent biofilm. We also found that mice mount a specific IgG response against three proteins (40, 47, and 56 kDa) regardless of the strain used, suggesting that these may be immuno-dominant antigens. PCR for the A. baumannii-specific parC gene confirmed a 100% infection rate with 75% of the MDR strains, and in vitro testing confirmed that all strains were sensitive to colistin. We also developed a real-time quantitative PCR (RTQ-PCR) assay that could detect as few as 10 copies of parC in a sample. To demonstrate the efficacy of colistin prophylaxis in this model, mice were treated with either parenteral colistin (0.2 mg colistinmethate i.m. for 7 days), local colistin (PMMA bead impregnated with 1.0 mg colistin sulfate), or an unloaded PMMA bead control. While the parenteral colistin failed to demonstrate any significant effects versus the placebo, the colistin PMMA bead significantly reduced the infection rate such that only 29.2% of the mice had detectable levels of parC at 19 days (p < 0.05 vs. i.m. colistin and placebo). © 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27: 1008–1015, 2009

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