Overview
Acute bacterial arthritis (ABA) is an infection of the joint space. It requires prompt diagnosis and management to prevent joint destruction and systemic complications 1.Diagnosis
Diagnosis is based on clinical suspicion, laboratory findings, and imaging 1.
Key diagnostic findings include joint effusion, erythema, warmth, pain with passive range of motion, and fever 1.
Arthrocentesis with synovial fluid analysis is crucial, including cell count with differential, Gram stain, and culture 1.
Synovial fluid white blood cell count typically exceeds 50,000 cells/µL with a predominance of neutrophils 1.
Imaging modalities such as ultrasound or MRI may aid in diagnosis and identifying effusions 1.
The PIDS/IDSA guideline uses the GRADE approach for rating evidence certainty and recommendation strength 1.Management
Empiric antibiotic therapy should be initiated promptly after obtaining synovial fluid for Gram stain and culture 1.
Antibiotic choice should be guided by Gram stain results, local resistance patterns, and patient age 1.
For neonates, initial therapy may include vancomycin plus a third-generation cephalosporin 1.
For children >3 months, initial therapy often includes a third-generation cephalosporin (e.g., ceftriaxone) 1.
Surgical drainage (arthrotomy or arthroscopy) may be indicated for joint lavage, especially in cases of significant effusion or failure to improve with antibiotics 1.
Joint immobilization and pain management are important adjunctive therapies 1.Special Populations
This guideline specifically addresses acute bacterial arthritis in children 1.Key Recommendations
Prompt initiation of empiric antibiotic therapy is recommended after synovial fluid Gram stain and culture are obtained 1. (Evidence: Strong)
Empiric antibiotic selection should be based on Gram stain results, local antimicrobial resistance patterns, and patient age 1. (Evidence: Strong)
Arthrocentesis for synovial fluid analysis (cell count, Gram stain, culture) is a critical diagnostic step 1. (Evidence: Strong)
Surgical intervention for joint lavage may be considered for patients with large effusions or those not responding to medical management 1. (Evidence: Moderate)References
1 Woods CR, Bradley JS, Chatterjee A, Kronman MP, Arnold SR, Robinson J et al.. Clinical Practice Guideline by the Pediatric Infectious Diseases Society (PIDS) and the Infectious Diseases Society of America (IDSA): 2023 Guideline on Diagnosis and Management of Acute Bacterial Arthritis in Pediatrics. Journal of the Pediatric Infectious Diseases Society 2024. link