Articles | Volume 10, issue 2 
            
                
                    
            
            
            https://doi.org/10.5194/jbji-10-61-2025
                    © Author(s) 2025. This work is distributed under 
the Creative Commons Attribution 4.0 License.
                the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jbji-10-61-2025
                    © Author(s) 2025. This work is distributed under 
the Creative Commons Attribution 4.0 License.
                the Creative Commons Attribution 4.0 License.
Multi-centre evaluation of Gram stain in the diagnosis of septic arthritis
Charlotte Smith
                                            Sheffield Health & Social Care NHS Foundation Trust, Centre Court, Atlas Way, Sheffield, S4 7QQ, UK
                                        
                                    Robert J. Maloney
                                            Department of Infection, Hull University Teaching Hospitals NHS Trust, Hull, UK
                                        
                                    Deborah Wearmouth
                                            Department of Infection, Hull University Teaching Hospitals NHS Trust, Hull, UK
                                        
                                    Hemant Sharma
                                            Department of Trauma and Orthopaedics, Hull University Teaching Hospitals NHS Trust, Hull, UK
                                        
                                    Kordo Saeed
                                            Department of Infection, University Hospital Southampton NHS Foundation Trust, Southampton, UK
                                        
                                    
                                            School of Clinical and Experimental Sciences, University of Southampton, Southampton, UK
                                        
                                    Nusreen Ahmad-Saeed
                                            Department of Infection, University Hospital Southampton NHS Foundation Trust, Southampton, UK
                                        
                                    Rachel Annett
                                            Public Health Wales, Hot Lab University Hospital of Llandough, Cardiff, Wales, UK
                                        
                                    Lucinda Barrett
                                            Oxford University Hospitals (OUH), Oxford, UK
                                        
                                    Sara E. Boyd
                                            David Price Evans Global Health and Infectious Disease Research Group,  University of Liverpool, Liverpool, L69 3GE, UK
                                        
                                    
                                            National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Du Cane Road, London, W12 0HS, UK
                                        
                                    
                                            Infection Clinical Academic Group, St. George's Hospital NHS Foundation Trust,  Blackshaw Road, London, SW17 0QT, UK
                                        
                                    Peter Davies
                                            Department of Microbiology, NHS Greater Glasgow and Clyde, Glasgow Royal Infirmary,  New Lister Building, Alexandra Parade, Glasgow, UK
                                        
                                    Harriet Hughes
                                            Public Health Wales Department of Microbiology, University Hospital of Wales, Cardiff, Wales, UK
                                        
                                    Gwennan Jones
                                            Public Health Wales Department of Microbiology, University Hospital of Wales, Cardiff, Wales, UK
                                        
                                    Laura Leach
                                            Oxford University Hospitals (OUH), Oxford, UK
                                        
                                    Maureen Lynch
                                            Department of Clinical Microbiology, Mater Misericordiae University Hospital, Dublin, Ireland
                                        
                                    Deepa Nayar
                                            Department of Microbiology, Newcastle upon Tyne Hospitals NHS Foundation Trust,  Newcastle upon Tyne, UK
                                        
                                    Martin Marsh
                                            Department of Orthopaedics, Newcastle upon Tyne Hospitals NHS Foundation Trust,  Newcastle upon Tyne, UK
                                        
                                    Shanine Mitchell
                                            Public Health Wales Department of Microbiology, University Hospital of Wales, Cardiff, Wales, UK
                                        
                                    Lynn Moffat
                                            Department of Microbiology, NHS Greater Glasgow and Clyde, Glasgow Royal Infirmary,  New Lister Building, Alexandra Parade, Glasgow, UK
                                        
                                    Luke S. P. Moore
                                            National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Du Cane Road, London, W12 0HS, UK
                                        
                                    
                                            Chelsea and Westminster NHS Foundation Trust, London, UK
                                        
                                    
                                            Imperial College Healthcare NHS Trust, North West London Pathology, Fulham Palace Road, London, UK
                                        
                                    Michael E. Murphy
                                            Department of Microbiology, NHS Greater Glasgow and Clyde, Glasgow Royal Infirmary,  New Lister Building, Alexandra Parade, Glasgow, UK
                                        
                                    
                                            College of Medical, Veterinary & Life Sciences, University of Glasgow,  Wolfson Medical School Building, Glasgow, UK
                                        
                                    Shaan Ashk O'Shea
                                            Department of Infection, University Hospital Southampton NHS Foundation Trust, Southampton, UK
                                        
                                    Teresa Peach
                                            Public Health Wales, Health Protection and Infection Division, Capital Quarter, Cardiff, Wales, UK
                                        
                                    Christina Petridou
                                            Department of Infection, Hampshire Hospitals NHS Foundation Trust, Winchester, UK
                                        
                                    Niamh Reidy
                                            Public Health Wales Department of Microbiology, University Hospital of Wales, Cardiff, Wales, UK
                                        
                                    Ben Talbot
                                            Department of Microbiology, Newcastle upon Tyne Hospitals NHS Foundation Trust,  Newcastle upon Tyne, UK
                                        
                                    Catherine Aldridge
                                            College of Medical, Veterinary & Life Sciences, University of Glasgow,  Wolfson Medical School Building, Glasgow, UK
                                        
                                    Gavin Barlow
CORRESPONDING AUTHOR
                                            
                                    
                                            Department of Infection, Hull University Teaching Hospitals NHS Trust, Hull, UK
                                        
                                    
                                            Experimental Medicine and Biomedicine, York Biomedical Research Institute,  Hull York Medical School, University of York, York, UK
                                        
                                    Related authors
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Tariq Azamgarhi, Simon Warren, Antonia Scobie, Natasha Karunaharan, Cristina Perez-Sanchez, Rebecca Houghton, Salma Hassan, Julie Lourtet-Hascoët, Hannah Kershaw, Parham Sendi, and Kordo Saeed
                                    J. Bone Joint Infect., 10, 93–100, https://doi.org/10.5194/jbji-10-93-2025, https://doi.org/10.5194/jbji-10-93-2025, 2025
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                                                This study evaluates dalbavancin, an antibiotic with a long duration of action, in treating complex bone and joint infections. It does not require daily dosing, allowing patients to leave the hospital earlier and reducing costs. Dalbavancin is shown to be effective and safe, especially for patients unsuitable for oral antibiotics or outpatient therapy, achieving similar results to traditional treatments while cutting healthcare costs.
                                            
                                            
                                        Stéphanie Pascual, Brooklyn Noble, Nusreen Ahmad-Saeed, Catherine Aldridge, Simone Ambretti, Sharon Amit, Rachel Annett, Shaan Ashk O'Shea, Anna Maria Barbui, Gavin Barlow, Lucinda Barrett, Mario Berth, Alessandro Bondi, Nicola Boran, Sara E. Boyd, Catarina Chaves, Martin Clauss, Peter Davies, Ileana T. Dianzo-Delgado, Jaime Esteban, Stefan Fuchs, Lennart Friis-Hansen, Daniel Goldenberger, Andrej Kraševac Glaser, Juha O. Groonroos, Ines Hoffmann, Tomer Hoffmann, Harriet Hughes, Marina Ivanova, Peter Jezek, Gwennan Jones, Zeynep Ceren Karahan, Cornelia Lass-Flörl, Frédéric Laurent, Laura Leach, Matilde Lee Horsbøll Pedersen, Caroline Loiez, Maureen Lynch, Robert J. Maloney, Martin Marsh, Olivia Milburn, Shanine Mitchell, Luke S. P. Moore, Lynn Moffat, Marianna Murdjeva, Michael E. Murphy, Deepa Nayar, Giacomo Nigrisoli, Fionnuala O'Sullivan, Büşra Öz, Teresa Peach, Christina Petridou, Mojgan Prinz, Mitja Rak, Niamh Reidy, Gian Maria Rossolini, Anne-Laure Roux, Patricia Ruiz-Garbajosa, Kordo Saeed, Llanos Salar-Vidal, Carlos Salas Venero, Mathyruban Selvaratnam, Eric Senneville, Peter Starzengruber, Ben Talbot, Vanessa Taylor, Rihard Trebše, Deborah Wearmouth, Birgit Willinger, Marjan Wouthuyzen-Bakker, Brianne Couturier, and Florence Allantaz
                                    J. Bone Joint Infect., 9, 87–97, https://doi.org/10.5194/jbji-9-87-2024, https://doi.org/10.5194/jbji-9-87-2024, 2024
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                                                This study conducted in multiple sites across Europe aimed to evaluate the BIOFIRE Joint Infection (JI) Panel, a new technology that uses multiplex PCR to detect microorganisms in synovial fluid of patients with suspicion of joint infections in 1 h, in comparison with synovial fluid culture. Results showed an overall agreement of 85 % to 88.4 % between the two methods. The JI Panel detected additional organisms, and the positive user experience highlights its clinical significance.
                                            
                                            
                                        Related subject area
            Subject: Microbiology of bone and joint infections | Topic: All topics
            
                    
                        
                            
                            
                                     
                                Yield of routine mycobacterial culture of osteoarticular specimens in a tertiary orthopaedic hospital in England, 2017–2022
                                
                                        
                                            
                                    
                            
                            
                        
                    
                    
                        
                            
                            
                            
                                     
                                Musculoskeletal infections associated with Nocardia species: a case series
                                
                                        
                                            
                                                
                                            
                                            
                                        
                                    
                            
                            
                            
                        
                    
                    
                        
                            
                            
                                     
                                Musculoskeletal manifestations of lower-extremity coccidioidomycosis: a case series
                                
                                        
                                            
                                    
                            
                            
                        
                    
                    
                        
                            
                            
                                     
                                Potential value of a rapid syndromic multiplex PCR for the diagnosis of native and prosthetic joint infections: a real-world evidence study
                                
                                        
                                            
                                    
                            
                            
                        
                    
                    
                        
                            
                            
                                     
                                Optimized decision algorithm for the microbiological diagnosis of osteoarticular infections in adults using synovial fluid samples: a prospective study in two French hospitals including 423 samples of synovial fluid
                                
                                        
                                            
                                    
                            
                            
                        
                    
                    
                        
                            
                            
                                     
                                Osteosynthesis-associated infection of the lower limbs by multidrug-resistant and extensively drug-resistant Gram-negative bacteria: a multicentre cohort study
                                
                                        
                                            
                                    
                            
                            
                        
                    
                    
                        
                            
                            
                            
                                     
                                Prosthetic joint infections caused by Mycobacterium avium complex: a series of five cases
                                
                                        
                                            
                                    
                            
                            
                            
                        
                    
                    
                        
                            
                            
                            
                                     
                                Diagnosis of orthopaedic-implant-associated infections caused by slow-growing Gram-positive anaerobic bacteria – a clinical perspective
                                
                                        
                                            
                                    
                            
                            
                            
                        
                    
                    
            
        
        Tom A. Yates, Olivier Vahesan, Simon Warren, and Antonia Scobie
                                    J. Bone Joint Infect., 9, 217–223, https://doi.org/10.5194/jbji-9-217-2024, https://doi.org/10.5194/jbji-9-217-2024, 2024
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                                                Our orthopaedic hospital attempts to culture tuberculosis (TB) bacteria from all bone and joint samples sent to the microbiology laboratory. We looked at 6162 TB cultures performed between 2017 and 2022. Bacteria that cause TB, or similar bacteria, were found in 1 in every 229 patients. Tests were more likely to be positive in people being investigated for cancer (sarcoma) and in samples from the spine, whereas they were much less likely to be positive in samples taken from replacement joints.
                                            
                                            
                                        Ryan B. Khodadadi, Jack W. McHugh, Supavit Chesdachai, Nancy L. Wengenack, Wendelyn Bosch, Maria Teresa Seville, Douglas R. Osmon, Elena Beam, and Zachary A. Yetmar
                                    J. Bone Joint Infect., 9, 207–212, https://doi.org/10.5194/jbji-9-207-2024, https://doi.org/10.5194/jbji-9-207-2024, 2024
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                                            In a multicenter retrospective study of musculoskeletal Nocardia infections (2011–2022), nine cases were identified. Disseminated disease occurred in 33 %, all in solid organ transplant recipients. Surgical intervention was common (89 %), with varied treatment duration (21–467 d). The 1-year mortality was 22%; all fatal cases involved disseminated disease. Localized infection generally had favorable outcomes compared to disseminated disease and requires a collaborative approach for management.
William Estes, L. Daniel Latt, Jacob Robishaw-Denton, Matthew L. Repp, Yash Suri, Tyson Chadaz, Christina Boulton, and Talha Riaz
                                    J. Bone Joint Infect., 9, 197–205, https://doi.org/10.5194/jbji-9-197-2024, https://doi.org/10.5194/jbji-9-197-2024, 2024
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                                                Musculoskeletal coccidioidomycosis can present in a variety of ways and often mimics non-infectious disease processes, making timely diagnosis challenging. Missed diagnosis can lead to devastating consequences, including joint destruction. Treatment often involves surgical debridement and prolonged antifungal therapy. Physicians in endemic areas should have a low threshold for obtaining Coccidioides-specific labs when patients present with unexplained musculoskeletal complaints.
                                            
                                            
                                        Stéphanie Pascual, Brooklyn Noble, Nusreen Ahmad-Saeed, Catherine Aldridge, Simone Ambretti, Sharon Amit, Rachel Annett, Shaan Ashk O'Shea, Anna Maria Barbui, Gavin Barlow, Lucinda Barrett, Mario Berth, Alessandro Bondi, Nicola Boran, Sara E. Boyd, Catarina Chaves, Martin Clauss, Peter Davies, Ileana T. Dianzo-Delgado, Jaime Esteban, Stefan Fuchs, Lennart Friis-Hansen, Daniel Goldenberger, Andrej Kraševac Glaser, Juha O. Groonroos, Ines Hoffmann, Tomer Hoffmann, Harriet Hughes, Marina Ivanova, Peter Jezek, Gwennan Jones, Zeynep Ceren Karahan, Cornelia Lass-Flörl, Frédéric Laurent, Laura Leach, Matilde Lee Horsbøll Pedersen, Caroline Loiez, Maureen Lynch, Robert J. Maloney, Martin Marsh, Olivia Milburn, Shanine Mitchell, Luke S. P. Moore, Lynn Moffat, Marianna Murdjeva, Michael E. Murphy, Deepa Nayar, Giacomo Nigrisoli, Fionnuala O'Sullivan, Büşra Öz, Teresa Peach, Christina Petridou, Mojgan Prinz, Mitja Rak, Niamh Reidy, Gian Maria Rossolini, Anne-Laure Roux, Patricia Ruiz-Garbajosa, Kordo Saeed, Llanos Salar-Vidal, Carlos Salas Venero, Mathyruban Selvaratnam, Eric Senneville, Peter Starzengruber, Ben Talbot, Vanessa Taylor, Rihard Trebše, Deborah Wearmouth, Birgit Willinger, Marjan Wouthuyzen-Bakker, Brianne Couturier, and Florence Allantaz
                                    J. Bone Joint Infect., 9, 87–97, https://doi.org/10.5194/jbji-9-87-2024, https://doi.org/10.5194/jbji-9-87-2024, 2024
                                    Short summary
                                    Short summary
                                            
                                                This study conducted in multiple sites across Europe aimed to evaluate the BIOFIRE Joint Infection (JI) Panel, a new technology that uses multiplex PCR to detect microorganisms in synovial fluid of patients with suspicion of joint infections in 1 h, in comparison with synovial fluid culture. Results showed an overall agreement of 85 % to 88.4 % between the two methods. The JI Panel detected additional organisms, and the positive user experience highlights its clinical significance.
                                            
                                            
                                        Céline Dupieux, Ghislaine Descours, Paul Verhoeven, Florence Grattard, Yvonne Benito, François Vandenesch, Céline Cazorla, Tristan Ferry, Sébastien Lustig, Bertrand Boyer, Sandrine Boisset, Anne Carricajo, Frédéric Laurent, and PIRLA investigator group
                                    J. Bone Joint Infect., 9, 37–48, https://doi.org/10.5194/jbji-9-37-2024, https://doi.org/10.5194/jbji-9-37-2024, 2024
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                                                We define an algorithm to optimize bone and joint infection diagnosis in adults on synovial fluid samples. This prospective multi-center study included a large number of synovial fluids and compared the performance of classical culture on different media, inoculation of synovial fluid in blood culture bottles, and broad-range and specific PCR. We proposed an algorithm associating culture onto three solid media and into blood culture bottles and 16S, Staphylococcus, and Streptococcus PCR.
                                            
                                            
                                        Efthymia Giannitsioti, Mauro José Salles, Andreas Mavrogenis, Dolors Rodriguez-Pardo, Ibai Los-Arcos, Alba Ribera, Javier Ariza, María Dolores del Toro, Sophie Nguyen, Eric Senneville, Eric Bonnet, Monica Chan, Maria Bruna Pasticci, Sabine Petersdorf, Natividad Benito, Nuala O' Connell, Antonio Blanco García, Gábor Skaliczki, Pierre Tattevin, Zeliha Kocak Tufan, Nikolaos Pantazis, Panayiotis D. Megaloikonomos, Panayiotis Papagelopoulos, Alejandro Soriano, Antonios Papadopoulos, and the ESGIAI collaborators study group
                                    J. Bone Joint Infect., 7, 279–288, https://doi.org/10.5194/jbji-7-279-2022, https://doi.org/10.5194/jbji-7-279-2022, 2022
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                                                Our multicentre study on a lower-limb osteosynthesis-associated infection (OAI) cohort by multidrug (MDR) and extensively drug (XDR) resistant Gram-negative bacteria found the following: implant retention with debridement was mostly performed in early OAI; 50.9 % of patients achieved remission of infection; remission reached 50 % (MDR) vs. 25 % (XDR) in early OAI and 60 % (MDR) vs. 44.4 % (XDR) in late OAI; age (> 60) and multiple surgeries were independent factors influencing lack of remission.
                                            
                                            
                                        Katharine Dobos, Gina A. Suh, Aaron J. Tande, and Shanthi Kappagoda
                                    J. Bone Joint Infect., 7, 137–141, https://doi.org/10.5194/jbji-7-137-2022, https://doi.org/10.5194/jbji-7-137-2022, 2022
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                                                This paper describes five cases of prosthetic joint infection (PJI) caused by Mycobacterium avium complex (MAC). Infections occurred in both immune competent and immunosuppressed patients. Interestingly, using the Musculoskeletal Infection Society diagnostic criteria for PJI may miss some cases of MAC PJI. Treatment courses and outcomes are described.
                                            
                                            
                                        Diana Salomi Ponraj, Thomas Falstie-Jensen, Nis Pedersen Jørgensen, Christen Ravn, Holger Brüggemann, and Jeppe Lange
                                    J. Bone Joint Infect., 6, 367–378, https://doi.org/10.5194/jbji-6-367-2021, https://doi.org/10.5194/jbji-6-367-2021, 2021
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                                                Implant-associated infections (IAIs) in orthopaedic surgery are associated with high morbidity and mortality. Slow-growing anaerobic bacteria are increasingly being recognized as potential causative agents in such infections, but their diagnosis is difficult. The purpose of this review is to summarize the current knowledge of IAIs with these bacteria. In particular, the review gives an overview of the current methodology in the diagnosis of such infections, to serve as a guide for clinicians.
                                            
                                            
                                        Cited articles
                        
                        Al-Tawil, K., Quiney, F., Pirkis, L., Birkett, N., and Rooney, A.: Gram stain microscopy in septic arthritis, Acta Orthop. Belg., 87, 553–556, 2021. 
                    
                
                        
                        Arieli, M. M., Fowler, M. L., Lieber, S. B., Shmerling, R. H., and Paz, Z.: The profile of the causative organisms which lead to septic arthritis of native joints over the last two decades in a single tertiary medical center in the east coast of the United States, Int. J. Clin. Pract., 75, e15003, https://doi.org/10.1111/ijcp.15003, 2021. 
                    
                
                        
                        Bram, J. T., Baldwin, K. D., and Blumberg, T. J.: Gram Stain is Not Clinically Relevant in Treatment of Pediatric Septic Arthritis, J. Pediatr. Orthop., 38, e536–e540, https://doi.org/10.1097/BPO.0000000000001226, 2018. 
                    
                
                        
                        Coakley, G., Mathews, C., Field, M., Jones, A., Kingsley, G., Walker, D., Phillips, M., Bradish, C., McLachlan, A., Mohammed, R., and Weston, V.: British Society for Rheumatology Standards, Guidelines and Audit Working Group, BSR & BHPR, BOA, RCGP and BSAC guidelines for management of the hot swollen joint in adults, Rheumatology, 8, 1039–1041, https://doi.org/10.1093/rheumatology/kel163a, 2006.  
                    
                
                        
                        Cunningham, G., Seghrouchni, K., Ruffieux, E., Vaudaux, P., Gayet-Ageron, A., Cherkaoui, A., Godinho, E., Lew, D., Hoffmeyer, P., and Uçkay, I.: Gram and acridine orange staining for diagnosis of septic arthritis in different patient populations, Int. Orthop., 38, 1283–1290, https://doi.org/10.1007/s00264-014-2284-3, 2014. 
                    
                
                        
                        Dey, M., Al-Attar, M., Peruffo, L., Coope, A., Zhao, S. S., Duffield, S., and Goodson, N.: Assessment and diagnosis of the acute hot joint: a systematic review and meta-analysis, Rheumatology, 62, 1740–1756, https://doi.org/10.1093/rheumatology/keac606, 2023. 
                    
                
                        
                        Gbejuade, H., Elsakka, M., and Cutler, L.: How well does synovial fluid gram staining correlate with cultures in native joint infections?, Orthop. Rev., 11, 8156, https://doi.org/10.4081/or.2019.8156, 2019. 
                    
                
                        
                        Holzmeister, A., Frazzetta, J., Yuan, F. F. N., Cherones, A., Summers, H., Cohen, J., and Lack, W. D.: Evaluation for septic arthritis of the native adult knee is aided by multivariable assessment, Am. J. Emerg. Med., 46, 614–618, https://doi.org/10.1016/j.ajem.2020.11.048, 2021. 
                    
                
                        
                        Lauper, N., Davat, M., Gjika, E., Müller, C., Belaieff, W., Pittet, D., Lipsky, B. A., Hannouche, D., and Uçkay, I.: Native septic arthritis is not an immediate surgical emergency, J. Infect., 77, 47–53, https://doi.org/10.1016/j.jinf.2018.02.015, 2018. 
                    
                
                        
                        McBride, S., Mowbray, J., Caughey, W., Wong, E., Luey, C., Siddiqui, A., Alexander, Z., Playle, V., Askelund, T., Hopkins, C., Quek, N., Ross, K., Orec, R., Mistry, D., Coomarasamy, C., and Holland, D.: Epidemiology, Management, and Outcomes of Large and Small Native Joint Septic Arthritis in Adults, Clin. Infect. Dis., 70, 271–279, https://doi.org/10.1093/cid/ciz265, 2020. 
                    
                
                        
                        Prior-Español, Á., García-Mira, Y., Mínguez, S., Martínez-Morillo, M., Gifre, L., and Mateo, L.: Coexistence of septic and crystal-induced arthritis: A diagnostic challenge. A report of 25 cases, Reumatol. Clin., 15, e81–e85, https://doi.org/10.1016/j.reuma.2017.12.015, 2019. 
                    
                
                        
                        Rutherford, A. I., Subesinghe, S., Bharucha, T., Ibrahim, F., Kleymann, A., and Galloway, J. B.: A population study of the reported incidence of native joint septic arthritis in the United Kingdom between 1998 and 2013, Rheumatology, 55, 2176–2180, https://doi.org/10.1093/rheumatology/kew323, 2016. 
                    
                
                        
                        Saeed, K., Ahmad-Saeed, N., Annett, R., Barlow, G., Barrett, L., Boyd, S. E., Boran, N., Davies, P., Hughes, H., Jones, G., Leach, L., Lynch, M., Nayar, D., Maloney, R. J., Marsh, M., Milburn, O., Mitchell, S., Moffat, L., Moore, L. S. P., Murphy, M. E., O'Shea, S. A., O'Sullivan, F., Peach, T., Petridou, C., Reidy, N., Selvaratnam, M., Talbot, B., Taylor, V., Wearmouth, D., and Aldridge, C.: A multicentre evaluation and expert recommendations of use of the newly developed BioFire Joint Infection polymerase chain reaction panel, Eur. J. Clin. Microbiol. Infect. Dis., 42, 169–176, https://doi.org/10.1007/s10096-022-04538-w, 2023. 
                    
                
                        
                        Stirling, P., Faroug, R., Amanat, S., Ahmed, A., Armstrong, M., Sharma, P., and Qamruddin, A.: False-negative rate of gram-stain microscopy for diagnosis of septic arthritis: suggestions for improvement, Int. J. Microbiol., 2014, 830857, https://doi.org/10.1155/2014/830857, 2014.  
                    
                
                        
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                        Walinga, A. B., Stornebrink, T., Langerhuizen, D. W. G., Struijs, P. A. A., Kerkhoffs, G. M. M. J., and Janssen, S. J.: What are the best diagnostic tests for diagnosing bacterial arthritis of a native joint?: a systematic review of 27 studies, Bone Joint J., 103-B, 1745–1753, https://doi.org/10.1302/0301-620X.103B12.BJJ-2021-0114.R1, 2021. 
                    
                Short summary
            Urgent analysis of joint fluid is a common test in patients with possible septic arthritis (bacterial infection of a joint). One aspect of this test, called the Gram stain, is considered important clinically, but previous single hospital studies have suggested it will miss a considerable number of infections. This large multi-hospital UK study assessed this test and found that it will miss 73 % of infections, questioning its value. More research on rapid tests using new technologies is required.
            Urgent analysis of joint fluid is a common test in patients with possible septic arthritis...
            
         
                        
                                         
                        
                                         
                        
                                         
                        
                                         
                        
                                         
                        
                                         
             
             
            