What is the joint at the base of the thumb?
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he thumb is made up of two phalanges (one distal phalanx and one proximal phalanx), and one metacarpal. At the "visible base" of the thumb, or where the thumb seems to enter the hand, there is a condyloid synovial joint, which involves the articulation of the proximal phalanx on the first metacarpal. The TRUE base of the thumb is where the first metacarpal articulates with the trapezium (a carpal bone of the hand). This joint is a saddle-type synovial joint.
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