This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Blount disease is a growth disorder of the shin bone (tibia) characterized by inward turning of the lower leg (bowing) that slowly worsens over time. While it is not uncommon for young children to have bowed legs, typically the bowing improves with age. There are two types of Blount disease (early-onset and late-onset), based on whether symptoms begin before or after four years of age. Blount disease may occur in one or both legs and can lead to shortening of the affected leg and other changes within bones of the legs. The cause of Blount disease is not well understood; however, a variety of hereditary and genetic factors are likely involved. The condition is more common among certain populations and is associated with obesity and early walking. Treatment may involve bracing and/or surgery.
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