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Laboratory-based versus qualitative assessment of α-defensin in periprosthetic hip and knee infections: a systematic review and meta-analysis

  • Orthopaedic Surgery
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Two methods are currently available for the assay of α-defensin: the enzyme-linked immunosorbent assay (ELISA) and the lateral flow test. We aimed to assess the diagnostic accuracy of synovial fluid α-defensin and to compare the accuracy of the laboratory-based test and the qualitative assessment for the diagnosis of hip and knee prosthetic infection.

Materials and methods

We searched (from inception to May 2018) MEDLINE, Scopus, EMBASE, Web of Science, and Cochrane for studies on α-defensin in the diagnosis of periprosthetic joint infection (PJI). Sensitivity, specificity, positive and negative likelihood ratio (LR), and diagnostic odds ratio were analyzed using the bivariate diagnostic random-effects model. The receiver-operating curve for each method was calculated.

Results

We included 13 articles in our meta-analysis, including 1170 patients who underwent total hip and knee arthroplasties revision; 368 (31%) had a joint infection according to MSIS and MSIS-modified criteria. Considering the false-positive result rate of 8% and false-negative result rate of 3%, pooled sensitivity and specificity were 0.90 (95% CI 0.83–0.94) and 0.95 (0.92–0.96), respectively. The area under the curve (AUC) was 0.94 (0.92–0.94). No statistical differences in terms of sensitivity and specificity were found between the laboratory-based and qualitative test. The pooled sensitivity and specificity of the two alpha-defensin assessment methods were: laboratory-based test 0.97 (95% CI 0.93–0.99) and 0.96 (95% CI 0.94–0.98), respectively; qualitative test 0.83 (95% CI 0.73–0.91) and 0.94 (95% CI 0.89–0.97), respectively.

The diagnostic odds ratio of the α-defensin laboratory based was superior to that of the qualitative test (1126.085, 95% CI 352.172–3600.702 versus 100.9, 95% CI 30.1–338.41; p < 0.001). The AUC for immunoassay and qualitative tests was 0.97 (0.95–0.99) and 0.91 (0.88–0.99), respectively.

Conclusion

Detection of α-defensin is an accurate test for diagnosis of hip and knee prosthetic infections. The diagnostic accuracy of the two alpha-defensin assessment methods is comparable. The lateral flow assay is a valid, rapid, and more available diagnostic tool, particularly to rule out PJI.

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Authors and Affiliations

  1. Section of Orthopaedic Surgery, Department of Public Health, School of Medicine, Federico II University, Via S. Pansini 5, 80131, Naples, Italy

    Giovanni Balato, Vincenzo de Matteo, Sigismondo Luca Di Donato, Cristiano De Franco, Francesco Smeraglia & Massimo Mariconda

  2. Department of Infectious Diseases, D. Cotugno Hospital, AORN Dei Colli, Naples, Italy

    Tiziana Ascione

  3. IFCA Institute, Florence, Italy

    Andrea Baldini

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  1. Giovanni Balato
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Correspondence to Giovanni Balato.

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Balato, G., de Matteo, V., Ascione, T. et al. Laboratory-based versus qualitative assessment of α-defensin in periprosthetic hip and knee infections: a systematic review and meta-analysis. Arch Orthop Trauma Surg 140, 293–301 (2020). https://doi.org/10.1007/s00402-019-03232-5

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