Orthonotes
Orthonotes
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Blount’s Disease — Langenskiöld Classification

Pathologic varus from disordered endochondral growth of medial proximal tibial physis; early walkers/obesity risk. **Langenskiöld stages I–VI** describe progressive physeal/epiphyseal changes (beaking → depression → physeal bar). Differentiate from physiologic bowing using **metaphyseal–diaphyseal angle** (>11° suggests Blount). Management: **Bracing** in early Stage I–II (

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Pathologic varus from disordered endochondral growth of medial proximal tibial physis; early walkers/obesity risk. **Langenskiöld stages I–VI** describe progressive physeal/epiphyseal changes (beaking → depression → physeal bar). Differentiate from physiologic bowing using **metaphyseal–diaphyseal angle** (>11° suggests Blount). Management: **Bracing** in early Stage I–II (<3 yrs); **guided growth** (hemiepiphysiodesis) or **proximal tibial osteotomy** in advanced stages/older children. Adolescent Blount involves proximal tibial physis closure medially—osteotomy + sometimes external fixation for multiplanar correction.
MCQs

High-yield practice questions

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Question 1

What is the primary cause of Blount's disease?

Question 2

At what age does Stage I of the Langenskiöld classification typically present?

Question 3

What characteristic finding distinguishes Blount's disease from physiological bowing?

Question 4

In which stage of Langenskiöld classification is bracing still considered effective?

Question 5

Which of the following is a potential management option for Stage I Blount's disease?

Question 6

What is the primary feature observed in Stage IV of the Langenskiöld classification?

Question 7

What distinguishes adolescent Blount's disease from the infantile form?

Question 8

Which surgical intervention is indicated in Stage III of Blount's disease?

Question 9

What is a common risk factor for both infantile and adolescent forms of Blount's disease?

Question 10

Which statement is true regarding the Langenskiöld classification?