The thumb joint is one of the most mobile joints in the hand.  It is located at the base of the thumb.  A healthy thumb joint can move in and out and move up and down.  It can also be moved to oppose the other fingers in the hand.  A healthy thumb can be use to grip things, and to steady items when being held in the hand. The thumb, over time, will begin to lose its ability to do precision things in combination with other the other fingers on the hand. This can result in joint deterioration and arthritis for some individuals. When symptoms are not relieved by non-surgical methods, joint reconstructive surgery, called Arthroplasty, may be appropriate.