Final answer:
Redundant skin over the sinus tarsi in Talipes Equinovarus (clubfoot) is due to the foot's inward and downward position at birth, causing excess skin over the ankle area.
Step-by-step explanation:
The redundant skin over the sinus tarsi in Talipes Equinovarus (TEV), commonly known as clubfoot, results from the positioning and structure of the foot due to the congenital condition. In TEV, the foot is turned inward and downward at birth, which can create a pocket of excess skin over the sinus tarsi - an anatomical space on the side of the ankle. This skin redundancy occurs because, during the development of the fetus, the foot assumes an abnormal position that does not allow the skin to stretch and conform to the contours of a normally aligned foot and ankle.