MSK imaging: Blount disease: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · MSK imaging: Blount disease

Sample item

A 2-year-old walking toddler has progressive unilateral bowing of the leg. Radiographs show a depressed medial tibial metaphysis with beaking and a medially sloping physis. What is the diagnosis?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Infantile tibia vara (Blount disease)

Blount disease is a growth disturbance of the medial proximal tibial physis causing progressive varus with metaphyseal beaking. Physiological bowing corrects with growth and has no focal beaking. Rickets shows widened, frayed physes.

Option by option

  • A. Rickets

    Rickets involves widened, frayed physes in several bones.

  • B. Infantile tibia vara (Blount disease) (correct)

    Correct. Medial beaking with varus is Blount disease.

  • C. Achondroplasia

    Achondroplasia shows rhizomelic shortening.

  • D. Physiological bowing

    Physiological bowing lacks focal medial beaking.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is B, Infantile tibia vara (Blount disease). Blount disease is a growth disturbance of the medial proximal tibial physis causing progressive varus with metaphyseal beaking.

Why is "Rickets" not the answer?

Rickets involves widened, frayed physes in several bones.

Why is "Achondroplasia" not the answer?

Achondroplasia shows rhizomelic shortening.

Why is "Physiological bowing" not the answer?

Physiological bowing lacks focal medial beaking.

What concept does this question test?

It tests MSK imaging: Blount disease in Radiology. Physiological bowing corrects with growth and has no focal beaking. Rickets shows widened, frayed physes.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study MSK imaging: Blount disease?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.