Paediatric: Ilizarov method: 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.

Try it

Orthopaedics · Paediatric: Ilizarov method

Sample item

In distraction osteogenesis by the Ilizarov method, which rate and rhythm of lengthening is generally used?

A1 cm per day in one stepB1 mm per day in divided increments after a latency periodCNo latency and rapid stretchingD0.1 mm per week

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

The answer and the reasoning

B. 1 mm per day in divided increments after a latency period

After a corticotomy and a latency period of about 5 to 7 days, the bone segments are distracted at about 1 mm per day in four steps of 0.25 mm. This allows new bone to form in the gap under tension, as per the law of tension-stress.

Option by option

A. 1 cm per day in one step
A 1 cm daily rate would prevent bone formation.
B. 1 mm per day in divided increments after a latency period (correct)
Correct. About 1 mm per day in divided steps is standard.
C. No latency and rapid stretching
Rapid stretching without latency impairs regenerate formation.
D. 0.1 mm per week
0.1 mm per week is far too slow and would lead to premature consolidation.

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 B, 1 mm per day in divided increments after a latency period. After a corticotomy and a latency period of about 5 to 7 days, the bone segments are distracted at about 1 mm per day in four steps of 0.

Why is "1 cm per day in one step" not the answer?

A 1 cm daily rate would prevent bone formation.

Why is "No latency and rapid stretching" not the answer?

Rapid stretching without latency impairs regenerate formation.

Why is "0.1 mm per week" not the answer?

0.1 mm per week is far too slow and would lead to premature consolidation.

What concept does this question test?

It tests Paediatric: Ilizarov method in Orthopaedics. 25 mm. This allows new bone to form in the gap under tension, as per the law of tension-stress.

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: Ilizarov method?

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.