Thumb Arthritis: Exercises - Only thumb
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The thumb is the first digit (finger) of the hand. Although your thumb is not actually a finger, The thumb contrasts with each of the other four by being the only digit that: Is opposable to the other four fingers; Has two phalanges rather than three. A thumb only has one joint and two phalanges. Anatomically, a thumb is unique. The position also sets the thumb apart. The thumb is out to the side of the hand.