Pathogen-specific biomarker profiles in periprosthetic joint infection

Area of Science:

• Orthopedics
• Infectious Diseases
• Clinical Diagnostics

Background:

• Periprosthetic joint infection (PJI) diagnosis relies on biomarkers, but pathogen-specific responses are unclear.
• Understanding how different microorganisms affect biomarkers is crucial for PJI management.

Purpose of the Study:

• To analyze serum C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), white blood cell (WBC) count, and synovial human β-defensin-1 (hBD-1) levels in PJI patients.
• To determine if specific bacterial pathogens correlate with distinct biomarker profiles in PJI.

Main Methods:

• Retrospective analysis of 105 synovial samples from revision arthroplasty patients (64 PJI, 41 aseptic failure).
• Quantification of serum CRP, ESR, WBC, and synovial hBD-1 using standardized methods.
• Statistical analysis to compare biomarker levels based on identified bacterial species.

Main Results:

• Synovial hBD-1 levels were significantly elevated in infections caused by Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, and Enterococcus sp.
• Serum CRP levels were higher in infections due to P. aeruginosa, S. epidermidis, S. aureus, Enterococcus sp, Peptoniphilus assaccharolyticus, and Finegoldia magna.
• ESR and WBC counts also showed significant differences compared to aseptic failure cases.

Conclusions:

• Biomarker responses in PJI are pathogen-dependent.
• Pathogen-specific biomarker profiles can enhance diagnostic accuracy and guide empirical antimicrobial therapy for PJI.
• Personalized PJI management strategies may benefit from incorporating these findings.