ArticleCureus2025
Joint Aspiration for the Diagnosis of Suspected Native Septic Arthritis.
Article in Cureus, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
introductionThe diagnostic accuracy of these joint aspirations in suspected native septic arthritis (SA) is debated as it is unclear whether negative culture results should preclude the use of antibiotics or the need for urgent surgical intervention. This study aimed to determine the diagnostic accuracy of native joint aspirations for SA in adult patients, and to determine clinical factors associated with a positive SA diagnosis.
methodsAll adult patients (≥16 years) undergoing aspiration of a major native joint at our centre over a two-year period between September 2019 and August 2021 were identified through a retrospective search of electronic laboratory records. Data relating to patient demographics, clinical and biochemical data, joint aspiration details, post-aspiration diagnosis, management, and patient outcomes were collected and analysed. Culture-negative SA was defined using Newman's criteria. Patients with joint prostheses or any existing orthopaedic metalwork in the affected joint were excluded.
resultsThere were 161 native joint aspirations included in the study. The rate of positive diagnosis of SA was 21/161 = 13.0%, of which 16/161 = 9.9% were culture-positive SA and 5/161 = 3.1% were culture-negative SA. The presence of organisms on Gram stain analysis, a high synovial white cell count (WCC), being pyrexial, a previous diagnosis of SA, and intravenous drug use (IVDU) were associated with a diagnosis of SA (all p < 0.05). A history of crystal arthropathy made the diagnosis of SA less likely (Odds Ratio (OR) = 0.195, 95% Confidence Interval (CI) 0.044 - 0.874, p = 0.019). The diagnostic value of serum WCC and C-reactive protein (CRP) were not statistically different in the SA and non-SA groups (both p > 0.05).
conclusionSynovial Gram stain and culture is still the preferred diagnostic test when it comes to accurately diagnosing native joint SA. However, while culture results are pending, a high index of suspicion for SA can be based on a combination of patient's clinical presentation, such as history of fever, previous SA, being IVDU, and a high synovial WCC. These diagnostic aids can help in guiding immediate and targeted antimicrobial therapy, and informing clinical decisions on the need for emergency surgical washout of the joint in the acute setting.
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