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Known scientifically as genu valgum, knock-knees is a condition in which the lower legs are angled outward. When a person with severe knock-knees stands with his or her legs fully straightened, the knees will touch, but the ankles will not. A similar condition, known as bowlegs, occurs when the knees angle outward, such that they do not touch when a person stands with his or her feet together. Both bowlegs and knock-knees are a normal part of child development. Typically, children will appear slightly bowlegged during the first three years of life. Around age two or three, children will develop some degree of knock-knees as they learn to walk properly. Normal developmental knock-knees generally straighten out by age five or six.
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