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Procalcitonin and α-Defensin for Diagnosis of Periprosthetic Joint Infections
Kai Xie1, Xinhua Qu1, Mengning Yan1
1Shanghai Key Laboratory of Orthopaedic Implant, Department of Orthopaedics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, PR China.
Background:
Current methods to diagnose periprosthetic joint infection (PJI) before revision surgery have limited diagnostic accuracy. This meta-analysis was performed to estimate the accuracy of procalcitonin (PCT) and α-defensin for the diagnosis of PJI.
Methods:
Articles on the diagnostic value of PCT or α-defensin for PJI diagnosis were searched in the PubMed database. Sensitivity, specificity, diagnostic odds ratio, the area under the curve of summary receiver operating characteristic curves (AUC), the positive likelihood ratio, and the negative likelihood ratio were calculated to evaluate the diagnostic ability of PCT and the α-defensin test for the diagnosis of PJI.
Results:
The pooled sensitivities for detecting PJI using PCT and α-defensin were 0.53 (95% confidence interval [CI], 0.24-0.80) and 0.96 (95% CI, 0.85-0.99), respectively. The pooled specificities for detecting PJI using PCT and α-defensin were 0.92 (95% CI, 0.45-0.99) and 0.95 (95% CI, 0.89-0.98), respectively. The pooled diagnostic odds ratios for detecting PJI using PCT and α-defensin were 13 (95% CI, 3-70) and 496 (95% CI, 71-3456), respectively. The pooled AUCs for PCT and α-defensin were 0.76 (95% CI, 0.72-0.80) and 0.99 (95% CI, 0.97-0.99), respectively. The positive likelihood ratio and the negative likelihood ratio of PCT were 6.8 (95% CI, 1.0-48.1) and 0.51 (95% CI, 0.31-0.84), respectively, whereas those of α-defensin were 19.6 (95% CI, 8.2-46.8) and 0.04 (95% CI, 0.01-0.17), respectively.
Conclusion:
Synovial fluid α-defensin has a great potential to diagnose PJI.
Insights
Synovial fluid alpha-defensin demonstrates high accuracy in diagnosing periprosthetic joint infection (PJI), outperforming procalcitonin (PCT). This finding offers a promising new tool for pre-revision surgery PJI detection.
Area of Science:
- Orthopedic Surgery
- Infectious Diseases
- Diagnostic Accuracy
Background:
- Periprosthetic joint infection (PJI) diagnosis before revision surgery lacks accuracy with current methods.
- Accurate pre-operative diagnosis is crucial for effective PJI management and patient outcomes.
Purpose of the Study:
- To evaluate the diagnostic accuracy of procalcitonin (PCT) and alpha-defensin for PJI.
- To compare the efficacy of PCT and alpha-defensin as biomarkers for PJI detection.
Main Methods:
- A meta-analysis was conducted using PubMed-searched articles.
- Diagnostic performance metrics including sensitivity, specificity, and AUC were calculated for PCT and alpha-defensin.
Main Results:
- Alpha-defensin showed superior diagnostic accuracy for PJI compared to PCT.
- Pooled sensitivity for alpha-defensin was 0.96 (vs. 0.53 for PCT) and specificity was 0.95 (vs. 0.92 for PCT).
- The area under the curve (AUC) for alpha-defensin was 0.99, significantly higher than PCT's 0.76.
Conclusions:
- Synovial fluid alpha-defensin exhibits significant potential for diagnosing PJI.
- Alpha-defensin offers a highly accurate biomarker for pre-revision surgery PJI detection.
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