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https://msapc.com/hand-center/wp-content/uploads/sites/6/2021/06/header-4.jpg1366500Definition The joint at the base of the thumb, called the trapeziometacarpal joint, is a common point of arthritis and can become very painful when the cartilage surfaces get worn down. Thumb arthritis, or basilar arthritis, involves degenerative changes of the CMC (carpal metacarpal) joint and affects the trapezium bone at the base of the...