Paediatric: prognosis of Perthes disease: practice question

A Orthopaedics 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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Orthopaedics · Paediatric: prognosis of Perthes disease

Sample item

Which factor indicates a poor prognosis in Legg-Calve-Perthes disease?

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

The answer and the reasoning

D. Onset after 8 years of age with lateral pillar group C involvement

Poor outcome is associated with onset after 8 years, female sex, extensive head involvement (Catterall III and IV, lateral pillar B/C and C), loss of movement and head at risk signs. Younger children have more time for remodelling.

Option by option

  • A. Normal range of movement

    Preserved movement is a favourable sign.

  • B. Onset before 5 years of age

    Onset before 5 years has a better prognosis.

  • C. Lateral pillar group A involvement

    Lateral pillar A has the best outcome.

  • D. Onset after 8 years of age with lateral pillar group C involvement (correct)

    Correct. Late onset and lateral pillar C carry poor prognosis.

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 Orthopaedics question

What is the answer to this Orthopaedics question?

The best answer is D, Onset after 8 years of age with lateral pillar group C involvement. Poor outcome is associated with onset after 8 years, female sex, extensive head involvement (Catterall III and IV, lateral pillar B/C and C), loss of movement and head at risk signs.

Why is "Normal range of movement" not the answer?

Preserved movement is a favourable sign.

Why is "Onset before 5 years of age" not the answer?

Onset before 5 years has a better prognosis.

Why is "Lateral pillar group A involvement" not the answer?

Lateral pillar A has the best outcome.

What concept does this question test?

It tests Paediatric: prognosis of Perthes disease in Orthopaedics. Younger children have more time for remodelling.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Paediatric: prognosis of Perthes disease?

Pair each fracture with its classic complication and nerve injured. Then use the flashcards and the other Orthopaedics 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.