Knock knees
Definition
In knock knees, the lower legs are at an outward angle, such that when the knees are touching, the ankles are separated.
Alternative Names
Genu valgum
Causes
Most children develop a slight knock-kneed stance by the time they are 2 or 3 years old, often with significant separation at the ankles when the knees are touching. This is part of normal development and often persists through age 5 or 6, at which time the legs begin to straighten fully. By puberty, most children can stand with the knees and ankles touching (without forcing the position).
Knock knees can also develop as a result of disease processes. Most often the cause has already been diagnosed and the knock knees are recognized as a symptom of the condition.
References
Sass P, Hassan G. Lower extremity abnormalities in children. Am Fam Physician. 2003 Aug 1;68(3):461-8. Review.
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