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Published in: Clinical Orthopaedics and Related Research® 10/2011

01-10-2011 | Basic Research

The In Vitro Elution Characteristics of Vancomycin from Tendons

Authors: Jane E. Grayson, PhD, Gary D. Grant, PhD, Shailendra Dukie, PhD, Christopher J. Vertullo, MBBS, FRACS

Published in: Clinical Orthopaedics and Related Research® | Issue 10/2011

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Abstract

Background

Infection after ACL reconstruction is uncommon but catastrophic. Prophylactic graft saturation in vancomycin reportedly reduces infection rates.

Questions/purposes

We characterized vancomycin elution from soaked tendons. Specifically, the effect of rinsing was studied. We also determined how vancomycin concentration in the soak solution and tendon dimension influenced this elution rate, and examined whether the vancomycin amount released was lower than osteoblast and chondroblast toxic concentrations.

Methods

Bovine tendons were wrapped in sterile gauze swabs presoaked with 5-, 2.5-, or 1.25-mg/mL vancomycin solutions. After 10 minutes, rinsed and unrinsed tendons were placed in 100 mL agitated 37°C phosphate-buffered saline (PBS). One-milliliter samples taken at 10 minutes and 1, 6, 12, 24, and 72 hours were analyzed by high-performance liquid chromatography.

Results

The maximum elution rate occurred between 10 minutes and 1 hour, with no lag between experiment initiation and drug appearance in the solution. Rinsing affected the initial amount in solution but had little influence on drug release after 10 minutes. Vancomycin diffusion rates were dependent on soak solution concentration at all sampling intervals. The vancomycin amount released or eluted did not increase after the 1-hour interval. At 24 hours, concentrations were 45 ± 12, 16 ± 1, and 9 ± 3 μg/mL for the 5-, 2.5-, and 1.25-mg/mL solutions, respectively. Higher elution rates were observed in larger-volume tendons.

Conclusions

Soaked tendon grafts can act as reservoirs for vancomycin, with the amount released and elution profile dependent on rinsing, tendon volume, and soak solution concentration. Vancomycin elution was lower than previously reported osteoblast and chondroblast toxicity concentrations and above the minimum inhibitory concentration for Staphylococcus.

Clinical Relevance

Presoaking ACL reconstruction autografts with vancomycin may reduce the risk of ACL reconstruction infection without the risk of local or general toxicity.
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Metadata
Title
The In Vitro Elution Characteristics of Vancomycin from Tendons
Authors
Jane E. Grayson, PhD
Gary D. Grant, PhD
Shailendra Dukie, PhD
Christopher J. Vertullo, MBBS, FRACS
Publication date
01-10-2011
Publisher
Springer-Verlag
Published in
Clinical Orthopaedics and Related Research® / Issue 10/2011
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI
https://doi.org/10.1007/s11999-011-1768-3

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