CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2022; 57(04): 689-696
DOI: 10.1055/s-0041-1732386
Artigo Original
Infectologia

Detection of Microorganisms in Clinical Sonicated Orthopedic Devices Using Conventional Culture and qPCR

Article in several languages: português | English
1   Laboratório de Doenças Infecciosas Emergentes (LEID), Escola de Medicina, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
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1   Laboratório de Doenças Infecciosas Emergentes (LEID), Escola de Medicina, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
,
2   School of Medicine, Department of Health Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
,
2   School of Medicine, Department of Health Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
,
2   School of Medicine, Department of Health Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
,
1   Laboratório de Doenças Infecciosas Emergentes (LEID), Escola de Medicina, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, PR, Brasil
› Author Affiliations

Abstract

Objective To evaluate the sensitivity and specificity of the quantitative real-time polymerase chain reaction (qPCR) for 16S rDNA gene screening using sonicated fluid from orthopedic implants.

Methods A retrospective study was conducted on 73 sonicated fluids obtained from patients with infection associated with orthopedic implants. The samples were subjected to conventional culture and molecular testing using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and qPCR for 16S rDNA. The cycle threshold values were used to define a cut-off of the qPCR of the 16S rDNA for negative and positive cultures.

Results No statistical differences were observed between the positive and negative culture groups based on the time from the first surgery to infection (p = 0.958), age (p = 0.269), or general comorbidities. Nevertheless, a statistical difference was found between the mean duration of antibiotic use before device removal (3.41 versus 0.94; p = 0.016). Bacterial DNA was identified in every sample from the sonicated fluids. The median cycle thresholds of the positive and negative cultures were of 25.6 and 27.3 respectively (p < 0.001). As a diagnostic tool, a cycle threshold cut-off of 26.89 demonstrated an area under the curve of the receiver operating characteristic of 0.877 (p ≤ 0.001).

Conclusion The presence of antimicrobial agents for more than 72 hours decreased culture positivity, but did not influence the qPCR results. Despite this, amplification of the 16S rDNA may overestimate infection diagnosis.

Financial Support

This study was supported by a grant of the MCTIC/CNPq, number 28/2018, level B.




Publication History

Received: 11 September 2020

Accepted: 19 February 2021

Article published online:
01 October 2021

© 2021. Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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