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Evaluating the Child with Acute Hip Pain (“Irritable Hip”) in a Lyme Endemic Region.

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Abstract

OBJECTIVES:

To estimate the prevalence of
Lyme infection among children presenting with acute, nontraumatic hip pain in a
Lyme endemic region and to investigate predictors of
Lyme disease among children with suspected transient synovitis.

STUDY DESIGN:

Retrospective cross-sectional study of children with unilateral hip pain who were brought to an academic pediatric emergency department. Cases were identified by specific discharge diagnoses or radiologic imaging.
Lyme infection was determined by serologic criteria, and a minimum prevalence was estimated for the entire study population; maximum estimate was determined for those who had
Lyme testing. Multivariate regression was used to identify discriminating clinical findings for
Lyme disease among those with nonseptic arthritis.

RESULTS:

Three hundred eighty-five children with a median age of 5.4 years were studied; 15% of children had fever ?38.0°C and 40% had pain for less than 24 hours at evaluation.
Lyme infection was identified in 5.2% (95% CI 3.2%-7.9%). A maximum estimate of
Lyme disease was calculated to be 8.0% (95% CI 4.9%-12.0%). Regression analysis did not identify any practical clinical predictors of
Lyme infection.

CONCLUSIONS:

Lyme infection occurred in approximately 5% of children with acute, nontraumatic hip pain who were evaluated in a pediatric emergency department in a
Lyme endemic region. Based on this estimate, we do not recommend routine
Lyme testing when transient synovitis is suspected; however,
Lyme testing should be considered in children having laboratory studies obtained for alternative diagnoses such as septic/pyogenic arthritis and for those with an atypical clinical course for transient synovitis.

Copyright © 2014 Elsevier Inc. All rights reserved.

J Pediatr. 2014 Oct 25. pii: S0022-3476(14)00891-9. doi: 10.1016/j.jpeds.2014.09.040. [Epub ahead of print]

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