In acute haematogenous osteomyelitis of a child, plain radiographs of the affected limb typically remain normal for what duration after symptom onset?
- A 1 to 2 days
- B 10 to 14 days ✓
- C 3 to 4 weeks
- D 6 weeks
Correct answer: B. 10 to 14 days
Explanation
Plain films show nothing until approximately 30 to 50 percent of bone mineral has been lost, which takes 10 to 14 days. Early findings are deep soft tissue swelling, then periosteal elevation and lytic metaphyseal changes. This lag means a normal early radiograph never excludes osteomyelitis, and MRI, which detects marrow oedema within 24 to 48 hours, is the investigation of choice when suspicion is high.
Reference: Tachdjian's Pediatric Orthopaedics, 5th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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