The bone that articulates with the first metacarpal and is the source of the thumb's unique movement is Trapezium.
The first carpo-metacarpal joint of the thumb is crucial because it creates a saddle-shaped joint that allows the thumb's movement to move in a variety of directions, including flexion, extension, abduction, adduction, circumduction, and opposition.
The first metacarpal distally, the trapezoid medially, the scaphoid proximally, and the second metacarpal laterally articulate with the trapezium. One of the eight carpal bones that make up the hand is the trapezium, also referred to as the greater multangular. It is situated between the scaphoid and the first metacarpal bone and is the most lateral (radial) bone of the distal row.
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