Paediatric: osteochondritis dissecans of the knee: 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: osteochondritis dissecans of the knee

Sample item

In osteochondritis dissecans of the knee, which is the typical site of the lesion?

ALateral aspect of the medial femoral condyleBPatellar apexCMedial aspect of the lateral femoral condyleDTibial plateau centre

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

The answer and the reasoning

A. Lateral aspect of the medial femoral condyle

About 70 percent of knee osteochondritis dissecans lesions are in the classic location on the lateral part of the medial femoral condyle. The Wilson sign is pain with internal rotation and extension of the tibia, relieved by external rotation. A tunnel view radiograph shows the lesion.

Option by option

A. Lateral aspect of the medial femoral condyle (correct)
Correct. The lateral aspect of the medial femoral condyle is the usual site.
B. Patellar apex
The patella is an uncommon site.
C. Medial aspect of the lateral femoral condyle
The lateral femoral condyle is less often involved.
D. Tibial plateau centre
The tibial plateau is rarely involved.

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.

Questions about this Orthopaedics question

What is the answer to this Orthopaedics question?

The best answer is A, Lateral aspect of the medial femoral condyle. About 70 percent of knee osteochondritis dissecans lesions are in the classic location on the lateral part of the medial femoral condyle.

Why is "Patellar apex" not the answer?

The patella is an uncommon site.

Why is "Medial aspect of the lateral femoral condyle" not the answer?

The lateral femoral condyle is less often involved.

Why is "Tibial plateau centre" not the answer?

The tibial plateau is rarely involved.

What concept does this question test?

It tests Paediatric: osteochondritis dissecans of the knee in Orthopaedics. The Wilson sign is pain with internal rotation and extension of the tibia, relieved by external rotation. A tunnel view radiograph shows the lesion.

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 Paediatric: osteochondritis dissecans of the knee?

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.