https://en.wikipedia.org/wiki/Genu_varum
WebGenu varum (also called bow-leggedness, bandiness, bandy-leg, and tibia vara) is a varus deformity marked by (outward) bowing at the knee, which means that the lower leg is angled inward in relation to the thigh's axis, giving the limb overall the appearance of an archer's bow.Usually medial angulation of both lower limb bones (femur and tibia) is involved.