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Distinguishing Lyme from septic knee monoarthritis in Lyme disease-endemic areas

Julia K Deanehan1, Amir A Kimia, Sharman P Tan Tanny

  • 1Division of Emergency Medicine, Boston Children’s Hospital andHarvard Medical School, Boston, MA 02115, USA.

Pediatrics
|February 20, 2013
PubMed

Insights

In children with knee monoarthritis, specific laboratory criteria can identify those at low risk for septic arthritis, potentially avoiding the need for joint fluid analysis.

Area of Science:

  • Pediatric Rheumatology
  • Infectious Diseases
  • Clinical Decision Making

Background:

  • Lyme and septic arthritis present similarly in children with knee monoarthritis.
  • Distinguishing between these conditions is crucial for appropriate management.
  • Arthrocentesis, while diagnostic, is invasive.

Purpose of the Study:

  • To identify children with knee monoarthritis at low risk for septic arthritis.
  • To develop and validate a clinical prediction model to guide arthrocentesis decisions.
  • To reduce unnecessary invasive procedures in pediatric patients.

Main Methods:

  • Retrospective study of 673 children with knee monoarthritis in Lyme-endemic areas.
  • Defined septic arthritis, Lyme arthritis, and other inflammatory arthritis based on clinical and laboratory findings.
  • Used recursive partitioning to derive a prediction model and externally validated it.

Main Results:

  • Septic arthritis occurred in 3% of patients; Lyme arthritis in 51%; other inflammatory arthritis in 46%.
  • Key predictors for septic arthritis were absolute neutrophil count ≥10 × 10(3)/mm³ and erythrocyte sedimentation rate ≥40 mm/hr.
  • Children with both absolute neutrophil count <10 × 10(3)/mm³ and erythrocyte sedimentation rate <40 mm/hr had no septic arthritis (100% sensitivity).

Conclusions:

  • Laboratory criteria, including neutrophil count and ESR, can effectively identify children with knee monoarthritis at low risk for septic arthritis.
  • This model may help clinicians avoid unnecessary arthrocentesis in select pediatric patients.
  • Further validation could support the integration of these criteria into clinical practice guidelines.
Abstract

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