There are not one but two unique variations of leg length discrepancies, congenital and acquired. Congenital means that you are born with it. One leg is anatomically shorter than the other. As a result of developmental phases of aging, the brain picks up on the walking pattern and identifies some variance. The entire body usually adapts by tilting one shoulder to the "short" side. A difference of under a quarter inch isn't very irregular, doesn't need Shoe Lifts to compensate and typically does not have a profound effect over a lifetime.