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Updated: Sep 29, 2025

Knee Arthrocentesis in Adults
Published on: February 25, 2022
Developments in diagnosis and treatment of paediatric septic arthritis
Cornelia M Donders1, Anne J Spaans2, Herbert van Wering3
1Department of Orthopaedic Surgery, Meander Medical Centre, Amersfoort 3813 TZ, Netherlands. lilian.donders@gmail.com.
Insights
Prompt diagnosis and treatment of acute septic arthritis in children are crucial to prevent joint damage. Early signs include fever and joint tenderness, with imaging and joint fluid analysis aiding diagnosis.
Area of Science:
- Pediatric Orthopedics
- Infectious Diseases
- Diagnostic Imaging
Background:
- Acute septic arthritis in children is a medical emergency requiring prompt intervention.
- Delayed diagnosis or treatment can lead to severe joint damage and long-term disability.
- Clinical presentation can be challenging, particularly in younger children.
Purpose of the Study:
- To summarize current knowledge on the diagnosis and management of acute septic arthritis in pediatric patients.
- To highlight key diagnostic indicators and imaging modalities.
- To review effective joint drainage techniques and post-procedure monitoring.
Main Methods:
- Systematic review of existing literature on pediatric septic arthritis.
- Analysis of diagnostic criteria including clinical signs, imaging findings, and laboratory results.
- Evaluation of various joint drainage procedures and their outcomes.
Main Results:
- Joint tenderness and fever are significant indicators of septic arthritis.
- Ultrasound detects joint effusions; MRI is superior for identifying associated osteomyelitis.
- Diagnosis is strongly suggested by purulent joint fluid, positive cultures/gram stains, or high white blood cell counts (>50,000/mm³).
Conclusions:
- Prompt diagnosis and appropriate management, including effective joint drainage (needle aspiration, arthroscopy, arthrotomy), are essential.
- Staphylococcus aureus is the most common causative organism.
- Close monitoring of clinical and laboratory outcomes post-drainage is critical, with potential need for further procedures.
Abstract:
Acute septic arthritis in children is an orthopaedic emergency. A delay in diagnosis and inappropriate treatment can result in devastating damage to the joint with lifelong disability as a consequence. The clinical presentation can be a diagnostic challenge, especially in young children. A recent systematic review showed that joint tenderness and fever are important signals of septic arthritis. Ultrasound is helpful in detecting the presence of a joint effusion. Plain radiographs may show bone changes but magnetic resonance imaging is the most reliable imaging study for detecting concomitant osteomyelitis. The diagnosis of acute septic arthritis is highly suggestive when pus is aspirated from the joint, in case of a positive culture or a positive gram stain of the joint fluid, or if there is a white blood-cell count in the joint fluid of more than 50000/mm3. Staphylococcus aureus is the most commonly cultured organism. Recent systematic reviews have identified the most effective drainage techniques, including needle aspiration, arthroscopy and arthrotomy, depending on the affected joint. After the drainage procedure it is important to monitor the clinical and laboratory outcomes. Additional drainage procedures may be necessary in select cases.
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