The medical term for knock-knee – a deformity of the lower limbs in such a direction that when the limbs are straightened, the legs diverge from one another. As a result, in walking, the knees knock against each other. The amount of knock-knee is measured by the distance between the medial malleoli of the ankles, with the inner surfaces of the knee touching and the knee-caps facing forwards. The condition is so common in children between the ages of 2–6 years that it may almost be regarded as a normal phase in childhood. When marked, or persisting into later childhood, it can be corrected by surgery (osteotomy).
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