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The tiny adjoining wrist bones, like those in the top of the foot, allow humans various ranges of movement. Flexion, extension, rotation, and aligned positions all rely on the joint's ability to move. Drop your hand down in flexion. Pull back in hyper-extension. We can use our hands to button a shift, or turn a doorknob (wrist rotation). We can extend our pinkie to the side, say to reach a letter on a keyboard while our thumbs can pull in the opposite direction. We can lift a cup as easily as we can hit a tennis ball.

Without the smaller bones, our wrist and foot would have the limited movement of, say the kneecap which isn't intended to allow side movement in the joint. In the foot and ankle (front), the small bones allow our feet to bend. If each toe bone met with one flat "foot bone", we would be unable to walk because to walk means we must flex the entire foot, placing the toes down first as the heel lifts, and then the heel comes down while the toes lift in preparation of the next step. The wrist operates with the same concept, but since we no longer walk on our hands (as apes do), we don't realize how much work the small bones to in order to allow us a large range of motion in the wrist.

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