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Novel Diagnostics in Revision Arthroplasty: Implant Sonication and Multiplex Polymerase Chain Reaction
Published on: December 3, 2017
The Role of Sonication in Improving the Detection of Periprosthetic Joint Infections: a Prospective Analysis
Jakub Rapi1, Vasileios Apostolopoulos1,2, Filip Růžička3
1First Department of Orthopaedic Surgery, St. Anne's University Hospital and Faculty of Medicine, Masaryk University, Brno.
Purpose Of The Study:
The diagnosis of periprosthetic joint infection (PJI) can be particularly challenging in cases of low-grade chronic infection. The suspicion of infection is typically confirmed through cultures of synovial fluid and periprosthetic tissue. However, these methods may not always detect low-grade infections, which can lead to persistent infection and early failure of the prosthesis. The purpose of this study was to evaluate the effectiveness of sonication in enhancing the detection of PJI using polymerase chain reaction (PCR) analysis.
Material And Methods:
A prospective cohort of 26 patients, suspected of having mitigated PJI, underwent surgery at the First Department of Orthopaedic Surgery, St. Anne's University Hospital in Brno between 2019 and 2024. The cohort included 16 women and 10 men, aged 56 to 82 years, with infections involving hip (11 cases) or knee prostheses (15 cases). Standard PCR and sonication followed by PCR were used to confirm PJI.
Results:
In 20 out of 26 cases, both standard PCR and sonication-assisted PCR detected the infection(p= 0.014). However, in 6 cases, standard PCR failed to identify the pathogen, whereas sonication followed by PCR confirmed the infection. Among these, 4 cases had significantly positive results, and 2 showed weak positivity. The most common pathogens detected were coagulase-negative Staphylococcus (12 cases), followed by Staphylococcus aureus, Pseudomonas aeruginosa, and others.
Conclusions:
The findings of this study indicate that the integration of sonication with PCR markedly enhances the detection of PJI, especially in instances where standard PCR techniques may be insufficient, such as in low-grade chronic infections.
Insights
Sonication combined with PCR significantly improves periprosthetic joint infection (PJI) detection, especially for challenging low-grade chronic cases. This method enhances pathogen identification where standard PCR alone may fail, leading to better patient outcomes.
Area of Science:
- Orthopedic Surgery
- Infectious Diseases
- Molecular Diagnostics
Background:
- Diagnosing low-grade chronic periprosthetic joint infection (PJI) is challenging.
- Standard culture methods may fail to detect low-grade infections, risking prosthesis failure.
- Polymerase chain reaction (PCR) is a key diagnostic tool for PJI.
Purpose of the Study:
- To evaluate the effectiveness of sonication in enhancing PJI detection using PCR analysis.
- To assess if sonication improves the sensitivity of PCR for identifying pathogens in suspected PJI cases.
Main Methods:
- A prospective cohort of 26 patients with suspected PJI (hip or knee) was studied.
- Both standard PCR and sonication followed by PCR were performed on synovial fluid and periprosthetic tissue samples.
- Patients were aged 56-82 years, with 16 women and 10 men.
Main Results:
- Sonication-assisted PCR detected infection in 20 out of 26 cases (p=0.014).
- Standard PCR failed in 6 cases, but sonication followed by PCR confirmed infection in these patients.
- Coagulase-negative Staphylococcus was the most common pathogen identified.
Conclusions:
- Integrating sonication with PCR significantly enhances PJI detection rates.
- This combined approach is particularly valuable for diagnosing low-grade chronic infections where standard PCR is insufficient.
- Sonication-assisted PCR offers improved sensitivity for identifying causative pathogens in PJI.
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