Blount's Disease

Michelle Udeshi, MD

March 24, 2005


A 9-year-old boy presented to the emergency room with right knee pain after a fall.

Blount's disease.

The anteroposterior radiograph of both knees shows an irregularity of the medial epiphysis of the tibias bilaterally (Figure 1). The epiphysis on the left is more medially sloped than on the right. There is mild varus angulation of both metaphyses, which is more pronounced on the left. A bony protuberance or "beak" is identified at the medial aspect of the left tibial metaphysis. Both tibial growth plates are widened and irregular. There is no evidence of acute fracture or dislocation.

Anteroposterior radiograph of both knees shows varus angulation of the metaphysis, medial sloping of the epiphyses, and irregularity of the growth plates. There is apparent "beaking" of the medial cortical wall of the metaphyses (arrows).