Can next generation sequencing play a role in detecting pathogens in synovial fluid?

Area of Science:

• Orthopedics
• Infectious Diseases
• Molecular Diagnostics

Background:

• Periprosthetic joint infection (PJI) diagnosis is challenging due to high rates of culture-negative results.
• Accurate identification of causative pathogens is crucial for effective PJI treatment.

Purpose of the Study:

• To evaluate the utility of next-generation sequencing (NGS) for detecting microorganisms in synovial fluid from patients with suspected PJI.
• To compare NGS performance against traditional culture methods and inflammatory biomarkers.

Main Methods:

• A prospective, single-blinded study involving 86 synovial fluid samples from patients undergoing hip or knee aspiration.
• Analysis included C-reactive protein, human neutrophil elastase, total neutrophil count, alpha-defensin, culture, and NGS.

Main Results:

• NGS demonstrated concordance with culture-positive results and identified antibiotic-resistant bacteria missed by culture.
• NGS detected pathogens in culture-negative samples, particularly those with elevated alpha-defensin and inflammatory markers.
• NGS identified a predominant organism in presumed infected samples and diverse organisms in non-infected samples.

Conclusions:

• Next-generation sequencing is a valuable tool for identifying pathogens in both culture-positive and culture-negative synovial fluid samples.
• NGS enhances the diagnostic accuracy for periprosthetic joint infections, offering a comprehensive approach beyond traditional methods.