ANSWER
The diagnosis is Blount's disease. More common in black
children, the condition is thought to be an acquired
developmental disturbance of the medial tibial epiphyseal-metaphyseal
complex resulting from abnormal forces related to obesity,
the adolescent spurt, or residual physiologic bow leg.
In about half of all cases, it resolves spontaneously.
For further reading, see: F. Silverman
and J. P. Kuhn, Caffey's Pediatric X-Ray Diagnosis,
9th ed., Mosby, 1993, p. 1834.
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