What movement elevates the medial border of the foot?

The movement that elevates the medial border of the foot is inversion. Inversion occurs when the ankle joint allows the foot to turn inward, resulting in the medial border (the inner side) of the foot being lifted higher than the lateral border. This movement is critical for maintaining balance and can be particularly helpful when navigating uneven surfaces.

While adduction refers to moving a part of the body toward the midline, eversion involves turning the foot outward, and extension typically pertains to straightening a joint, such as the knee or elbow, rather than affecting the borders of the foot. Thus, these movements do not elevate the medial border in the same manner that inversion does. Inversion specifically changes the foot's orientation in a way that creates elevation of the inner side, making it the correct choice in this context.