Acute osteoarticular infections in children represent medical and surgical emergencies with potentially severe functional sequelae. 1 Hence, these infections require a rapid and sensitive diagnosis. Molecular diagnostic tools have dramatically improved the diagnostic yield of pediatric septic arthritis (SA). However, more than 20% of these infections remain unconfirmed because no microorganism is identified. 2 In such situations, the use of inflammatory markers may be helpful to quickly confirm the diagnosis. Serum C-reactive protein (CRP) level could be a useful tool, even if it is commonly lower during Kingella kingae infectionsthe leading causative agent in young children's arthritis. 2 Here we report a case of K. kingae knee arthritis with a high level of synovial calprotectin, an inflammatory biomarker recently successfully assessed in prosthetic joint infection (PJI). 3,4
| CASE REPORTAn otherwise healthy 14-month-old child was admitted to the pediatric emergency department after a 2-day history
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