A nurse in a pediatric clinic is assessing four children who present with hip or knee pain. Which child requires priority intervention?

A. An 8-year-old with intermittent knee pain after soccer practice: Intermittent knee pain after physical activity is often musculoskeletal and related to overuse or minor strain. While assessment and monitoring are needed, this presentation is non-urgent and does not indicate an immediate threat to joint integrity or systemic health. B. A 13-year-old overweight adolescent with sudden hip pain and the affected leg externally rotated: Sudden hip pain with external rotation of the leg in an overweight adolescent raises concern for slipped capital femoral epiphysis (SCFE), a serious orthopedic emergency. Prompt intervention is critical to prevent further slippage, avascular necrosis of the femoral head, and long-term disability. C. A 5-year-old with mild hip pain following a recent upper respiratory infection and a low-grade fever: This presentation may suggest transient synovitis, which is usually self-limiting and not immediately emergent. Close observation and follow-up are important, but it does not typically require urgent intervention. D. A 6-year-old with a painless limp for 2 months and limited hip abduction: A painless limp with limited hip movement may indicate chronic hip dysplasia or Legg-Calvé-Perthes disease. Although this requires evaluation, it is not acutely emergent compared with the risk of SCFE.