Blount Disease

  • Etiology: osteochondrosis with growth disturbance in proximal medial tibial epiphysis
  • Imaging: metaphyseal-diaphyseal angle (Drennan) > 11 degrees
  • DDX: physiologic bowing which shows a curved tibia while Blount disease has sharp angle at medial tibial epiphysis
  • Clinical: infantile (<3 years) usually bilateral, juvenile (4-10 years old), adolescent (> 11 years old) usually unilateral

Radiology Cases of Blount Disease

Radiograph of Blount disease
AP radiograph of the knee shows a sharp angulation at the medial tibial epiphysis. The remainder of the tibia is straight.