Conformational feature of the limbs when viewed from the front or the back. The axis of the distal portion of a limb shows a lateral deviation with respect to the axis of the proximal portion of the limb. The deviation is usually at the level of the carpus, tarsus or fetlock joint. The joint in question may lie medial to (inside) the normal limb axis; carpus valgus is therefore commonly known as "knock-knees."