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The wrist is a more complicated joint than the hip or the knee. On the hand side of the wrist, there are two rows of bones at the base of the hand. There are four bones in each row. The bones in these rows are called the carpals. The long thin bones of the hand radiate out from one row of carpals and form the basis of the fingers and thumb.
The elbow is a hinge joint which is made up of three bones: the humerus (upper arm bone), the ulna (forearm bone on the pinky finger side) and the radius (forearm bone on the thumb side).
Wrist replacement surgery may help retain or recover wrist movements. It may also improve the ability to perform daily living activities, especially if there is arthritis in the elbow and shoulder.