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Diagnostic Performance of a Molecular Assay in Synovial Fluid Targeting Dominant Prosthetic Joint Infection Pathogens
Jiyoung Lee1, Eunyoung Baek1, Hyesun Ahn2
1Department of Research & Development, DreamDX Inc., C001, 57, Oryundae-ro, Geumjeong-gu, Busan 46252, Republic of Korea.
Abstract:
Prosthetic joint infection (PJI) is one of the most serious complications of joint replacement surgery among orthopedic surgeries and occurs in 1 to 2% of primary surgeries. Additionally, the cause of PJIs is mostly bacteria from the Staphylococcus species, accounting for more than 98%, while fungi cause PJIs in only 1 to 2% of cases and can be difficult to manage. The current gold-standard microbiological method of culturing synovial fluid is time-consuming and produces false-negative and -positive results. This study aimed to identify a novel, accurate, and convenient molecular diagnostic method. The DreamDX primer-hydrolysis probe set was designed for the pan-bacterial and pan-fungal detection of DNA from pathogens that cause PJIs. The sensitivity and specificity of DreamDX primer-hydrolysis probes were 88.89% (95% CI, 56.50-99.43%) and 97.62% (95% CI, 87.68-99.88%), respectively, compared with the microbiological method of culturing synovial fluid, and receiver operating characteristic (ROC) area under the curve (AUC) was 0.9974 (*** p < 0.0001). It could be concluded that the DreamDX primer-hydrolysis probes have outstanding potential as a molecular diagnostic method for identifying the causative agents of PJIs, and that host inflammatory markers are useful as adjuvants in the diagnosis of PJIs.
Insights
A new molecular diagnostic method, DreamDX primer-hydrolysis probes, shows high accuracy for detecting bacterial and fungal pathogens causing prosthetic joint infections (PJIs). This method offers a promising alternative to traditional culture methods for faster and more reliable PJI diagnosis.
Area of Science:
- Orthopedic Surgery
- Infectious Diseases
- Molecular Diagnostics
Background:
- Prosthetic joint infection (PJI) is a severe complication of joint replacement surgery, occurring in 1-2% of primary procedures.
- Staphylococcus species are the primary cause of PJIs (>98%), with fungi accounting for 1-2% and posing management challenges.
- Current gold-standard synovial fluid culture methods are slow and prone to inaccuracies, necessitating improved diagnostic approaches.
Purpose of the Study:
- To develop and evaluate a novel, accurate, and convenient molecular diagnostic method for identifying PJI-causing pathogens.
- To assess the efficacy of DreamDX primer-hydrolysis probes for pan-bacterial and pan-fungal DNA detection in PJI diagnosis.
Main Methods:
- Design of DreamDX primer-hydrolysis probe sets for broad-range bacterial and fungal DNA detection.
- Comparative analysis of DreamDX probe performance against traditional synovial fluid culture methods.
- Evaluation of diagnostic accuracy using sensitivity, specificity, and ROC curve analysis.
Main Results:
- DreamDX primer-hydrolysis probes demonstrated high diagnostic accuracy with 88.89% sensitivity and 97.62% specificity.
- Receiver operating characteristic (ROC) analysis yielded an area under the curve (AUC) of 0.9974 (p < 0.0001), indicating excellent performance.
- Host inflammatory markers were identified as potentially useful adjunctive diagnostic tools.
Conclusions:
- DreamDX primer-hydrolysis probes show significant potential as a molecular diagnostic tool for identifying causative agents of PJIs.
- The developed molecular method offers a more accurate and convenient alternative to conventional microbiological techniques.
- Integration of host inflammatory markers may enhance the overall diagnostic capability for PJIs.
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