Orthopaedics: Perthes disease: practice question

A Pediatrics 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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Pediatrics · Orthopaedics: Perthes disease

Sample item

A 6-year-old boy has a limp and referred knee pain, with X-ray showing a sclerotic, flattened femoral head. What is the diagnosis?

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

The answer and the reasoning

D. Legg-Calve-Perthes disease

Perthes disease is idiopathic avascular necrosis of the femoral head in children aged 4 to 8 years, more common in boys. Management ranges from containment and observation to surgery. Slipped capital femoral epiphysis affects obese adolescents.

Option by option

  • A. Osgood-Schlatter disease

    Osgood-Schlatter involves the tibial tuberosity.

  • B. Septic arthritis

    Septic arthritis causes fever and severe pain.

  • C. Slipped capital femoral epiphysis

    SCFE occurs in obese adolescents.

  • D. Legg-Calve-Perthes disease (correct)

    Correct. Avascular necrosis of the femoral head in a 6-year-old.

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 Pediatrics question

What is the answer to this Pediatrics question?

The best answer is D, Legg-Calve-Perthes disease. Perthes disease is idiopathic avascular necrosis of the femoral head in children aged 4 to 8 years, more common in boys.

Why is "Osgood-Schlatter disease" not the answer?

Osgood-Schlatter involves the tibial tuberosity.

Why is "Septic arthritis" not the answer?

Septic arthritis causes fever and severe pain.

Why is "Slipped capital femoral epiphysis" not the answer?

SCFE occurs in obese adolescents.

What concept does this question test?

It tests Orthopaedics: Perthes disease in Pediatrics. Management ranges from containment and observation to surgery. Slipped capital femoral epiphysis affects obese adolescents.

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 Orthopaedics: Perthes disease?

Memorise milestones and the vaccine schedule as tables and revise them often. Then use the flashcards and the other Pediatrics 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.