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In our A to Z series on child health, childhood knock-knee is explained by doctors at Great Ormond Street Hospital What is knock-knee?

What is knock-knee?

Knock-knee (genu valgum) is when a child's knees are touching and the ankles are apart. It is most often seen in children between the ages of four and six years, when the body goes through a natural shifting of alignment. Just as dimples or cleft chins are normal facial variations, knock-knees and bow legs are examples of normal variation and rarely require treatment. In the vast majority of cases the problem sorts itself out without any help - as the child grows, their legs change shape and gradually straighten. Affected children will usually grow out of it.

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