Inflammatory markers limitations in the diagnosis of pediatric calcaneal osteomyelitis

Area of Science:

• Pediatric Orthopedics
• Infectious Diseases
• Medical Imaging

Background:

• Calcaneal osteomyelitis is an uncommon but critical diagnosis in limping children.
• Early recognition is vital to prevent complications like periosteal abscesses or growth plate injury.

Observation:

• Diagnosis typically involves clinical examination, imaging, and inflammatory markers (ESR, CRP).
• ESR and CRP show high sensitivity (94%, 95%) for osteomyelitis in general.
• However, reliability of these markers can be compromised in specific pediatric cases.

Findings:

• Infection in small bones, like the calcaneus, can lower marker sensitivity compared to long bones.
• Prior antibiotic treatment can also decrease the diagnostic accuracy of ESR and CRP.
• This case highlights two unique factors that diminish inflammatory marker sensitivity.

Implications:

• Clinicians must consider factors beyond standard inflammatory markers for diagnosing pediatric calcaneal osteomyelitis.
• Awareness of these limitations can improve diagnostic timeliness and patient outcomes.
• Further research into improved diagnostic modalities for pediatric bone infections is warranted.