What does it mean to have knocked knees?

Knocked Knees: It is a condition in which knees angle in and touch each other when the legsare straightened and there is inability to touch the feet together.The condition is called genu valgum.Mild cases in children correct by itself and otherwise there is no cure except in severe cases surgery called osteostomy can correct it, it is only cosmetic and may affect athletic activities in future and is controversial.

Knees pointing in: Knock knee is a condition that is called genu valgum. The knees turn inward and sometime touch.