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Updated: Feb 17, 2026
Knee Arthrocentesis in Adults
Published on: February 25, 2022
Risk factors for subsequent debridement in pediatric patients with septic arthritis of the knee: A case control study
Kian Niknam1, Katherine Bach2, Jennifer O'Donnell3
1Department of Orthopaedic Surgery, University of California, San Francisco, CA, USA.
Insights
Pediatric septic knee arthritis requires prompt treatment. Positive blood/synovial cultures and high synovial white blood cell counts (WBC) predict the need for further surgery in children with knee infections.
Area of Science:
- Pediatric Orthopedics
- Infectious Diseases
- Clinical Research
Background:
- Septic arthritis of the knee in children is uncommon but can lead to severe joint damage.
- Identifying prognostic factors for treatment failure is crucial for pediatric septic knee arthritis management.
- This study investigates predictors of subsequent surgical intervention in pediatric patients with septic knee arthritis.
Purpose of the Study:
- To identify clinical and laboratory findings at initial presentation that correlate with the need for repeat debridement in pediatric septic knee arthritis.
- To assess the association between specific biomarkers and treatment outcomes in pediatric septic knee arthritis.
- To provide data that can aid clinicians in predicting the course of septic knee arthritis in children.
Main Methods:
- Retrospective case-control study design.
- Inclusion of pediatric patients diagnosed with septic arthritis of the knee.
- Statistical analysis including univariate comparisons (chi-squared, t-tests, Fisher-exact) and multivariate logistic regression with AUROC analysis.
Main Results:
- A total of 41 pediatric patients were analyzed; 18 required subsequent debridement.
- Patients needing further surgery showed significantly higher rates of positive blood cultures (43.8% vs. 6.7%) and synovial cultures (66.7% vs. 26.1%).
- Elevated synovial white blood cell (WBC) counts (>100,000 cells/L) were also significantly associated with subsequent debridement (53.3% vs. 20.0%).
Conclusions:
- Positive blood cultures, positive synovial cultures, and synovial WBC counts >100,000 cells/L are significant predictors of requiring further surgical intervention in pediatric septic knee arthritis.
- These findings can assist clinicians in patient counseling regarding the risk of additional procedures.
- Early identification of these prognostic factors may improve management strategies for pediatric septic knee arthritis.
Background:
Septic knee arthritis in pediatric patients is rare; however, timely diagnosis and treatment is key in preventing damage to articular cartilage and other structures in the joint. Risk and prognostic factors associated with treatment failure have not yet been studied in this patient population. In this study, we aim to assess how various lab and clinical findings at time of initial presentation associate with need for subsequent debridement among pediatric septic knee patients.
Methods:
This is a retrospective, single-center, case-control study comparing patients who did and did not receive subsequent irrigation and debridement for septic arthritis of the knee. Risk factors were assessed through univariate comparisons, utilizing chi-squared tests, t-tests, and Fisher-exact tests, as appropriate. Multivariate logistic regression and area under the receiver operating characteristic (AUROC) analysis was used to assess discriminatory ability of identified risk factors. Significance was defined as p < 0.05.
Results:
A total of 41 patients were included in this study, of which 18 underwent subsequent debridement. Patients requiring subsequent debridement had higher rates of positive blood culture (43.8% vs. 6.7%, p = 0.04), positive synovial cultures (66.7% vs. 26.1%, p = 0.01), and synovial white blood cell counts (WBC) > 100,000 cells/L (53.3% vs. 20.0%, p = 0.04). When these three variables were placed in a logistic model, an AUROC of 0.82 was observed (95% confidence interval: 0.64-0.99).
Conclusions:
Positive blood and synovial cultures, and synovial WBC > 100,000 cells/L, were identified as significant prognostic factors for subsequent septic knee surgery. Clinicians should consider these factors when counseling patients and caregivers about risk for subsequent debridement.
Level Of Evidence:
III; Retrospective Case-Control Study.
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