skip to main content

Acute osteomyelitis — RACP Paediatrics MCQ

Instant feedback + full explanation. One question, done properly.

ModerateInfectious diseases and immunisationAcute osteomyelitisRACP Paediatrics

A 9-year-old has fever and refuses to bear weight. There is focal tenderness over the proximal tibia, CRP is 120 mg/L and blood cultures are pending; plain radiograph is normal. What is the most appropriate investigation?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — MRI of the affected limb

Acute osteomyelitis often has a normal early radiograph; MRI is the most sensitive imaging test to define bone and adjacent joint involvement. Delaying imaging and treatment risks abscess and joint complications. The pearl is that refusal to bear weight with high CRP should be treated as bone or joint infection until excluded.

Reference: RCH Clinical Practice Guidelines: Bone and joint infection; Therapeutic Guidelines (eTG): Antibiotic