Blount disease

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Blount disease

  1. 1. Dr / Hytham Nafady
  2. 2.   Congenital tibia vara Osteochondrosis tibiae deformans
  3. 3. Definition  Progressive tibial bowing related to growth suppression of the posteromedial proximal tibial physis.
  4. 4. Etiology Compressive stress on the posteromedial proximal tibial physis. Predisposing factors:  Early walking.  Overweight.  African American (more lax ligaments). 
  5. 5. Distribution  Bilateral > unilateral.
  6. 6. Types   Infantile form. Adolescent form.
  7. 7. Metaphyseal diaphyseal angle:    It is an angle between a line drawn through the widest portion of the proximal tibial metaphysis and another line drawn perpendicular to the long axis of the tibial shaft. Normally 0 – 11 > 11 = Blount disease.
  8. 8. DDx of Blount disease  Developmental (physiological) bowing: Developmental bowing Blount disease Disappear after 2 years. Progressive. Bilateral and symmetric. Unilateral or bilateral asymmetric. Metaphyseal diaphyseal angle < 11 Metaphyseal diaphyseal angle > 11
  9. 9. Surgical treatment of Blount disease  High tibial osteotomy (either curved or wedged osteotomies).

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