Comparison of broad-range polymerase chain reaction and metagenomic next-generation sequencing for the diagnosis of prosthetic joint infection

Purpose: The aims of our study were to (1) evaluate the concordance of both methods for detecting prosthetic joint infection (PJI) pathogens in joint fluid and to (2) clarify whether broad-range polymerase chain reaction (BR-PCR) can be used as a verification method for metagenomic next-generation sequencing (mNGS) for PJI diagnosis. Methods: In total, 63 patients underwent total joint arthroplasty, with 45 PJI and 18 aseptic failure patients included. Joint fluids were sampled after antibiotics were withheld for more than 2 weeks, and then, culture, BR-PCR and mNGS were performed for all samples. Results: The joint fluid BR-PCR sensitivity was 82.2%, which was not significantly different from that of mNGS (95.6%) or culture (77.8%). The specificities of the 3 methods were all 94.4%. BR-PCR failed to identify the pathogens in 1 polymicrobial infection patient and 4 fungal infection patients. Conclusion: mNGS was more sensitive than BR-PCR for detecting PJI pathogens in joint fluid. BR-PCR is insufficient for use as an mNGS verification method. (C) 2020 The Author(s). Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.