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. 2021 Sep 29;21(1):1018.
doi: 10.1186/s12879-021-06721-4.

The concordance between preoperative aspiration and intraoperative synovial fluid culture results: intraoperative synovial fluid re-cultures are necessary whether the preoperative aspiration culture is positive or not

Hao Li  1   2   3 , Chi Xu  2   3 , LiBo Hao  2   3 , Wei Chai  2   3 , Fu Jun #  4   5 , Jiying Chen #  6   7
Affiliations

The concordance between preoperative aspiration and intraoperative synovial fluid culture results: intraoperative synovial fluid re-cultures are necessary whether the preoperative aspiration culture is positive or not

Hao Li et al. BMC Infect Dis. .

Abstract

Aims: Preoperative aspiration culture and intraoperative cultures play pivotal roles in periprosthetic joint infection (PJI) diagnosis and pathogen identification. But the discordance between preoperative aspiration culture and intraoperative synovial fluid culture remains unknown. We aim to determine (1) the discordance between preoperative and intraoperative synovial fluid (SF) culture and. (2) compared to intraoperative synovial fluid cultures, the sensitivity of preoperative aspiration fluid culture. Then the following question is tried to be answered: Are intraoperative synovial fluid re-cultures necessary if the preoperative aspiration culture is positive?

Materials and methods: Between 2015 and 2019, 187 PJI patients managed with surgeries were included in this study. Compared to intraoperative synovial fluid culture, the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of preoperative aspiration culture were calculated. Then, the discordance between preoperative aspiration culture and intraoperative SF culture was analyzed.

Results: The sensitivity of preoperative aspiration culture was 81.29% compared to intraoperative synovial fluid cultures. Concordance was identified in 147 PJI (78.61%) patients and culture discordance occurred in 40 patients (21.39%). In these discordant PJI patients, 24 patients (60%) were polymicrobial and no intraoperative synovial fluid culture growth was found in 16 PJI cases (40%). Preoperative monomicrobial staphylococcus results had a sensitivity of and a specificity of 80.43% and 83.16%, respectively. Preoperative polymicrobial results had the lowest sensitivity.

Conclusions: The intraoperative synovial fluid re-cultures are necessary if the preoperative aspiration culture is positive and the discordance between preoperative aspiration culture and intraoperative synovial fluid culture should be noted especially when Streptococcus spp. and more than one pathogen was revealed by preoperative aspiration culture.

Level of evidence: Level III.

Keywords: Joint aspiration; Periprosthetic Joint Infection (PJI); Synovial fluid culture; Total joint arthroplasty (TJA).

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
The flowchart of patients included in this study
Fig. 2
Fig. 2
The design of this study
Fig. 3
Fig. 3
Sankey Diagram of Preoperative Aspiration and Intraoperative Synovial Fluid Culture Results. 1 = Staphylococcus spp.; 2 = Enterococcus spp.; 3 = Streptococcus spp.; 5 = Gram-positive Bacilli; 7 = Gram-negative Bacteria; 8 = Fungi; 9 = Polymicrobial PJI; 0 = Culture negative
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