CPT Code: 25447
The CMC joint (an abbreviation for carpometacarpal joint) of the thumb is where the metacarpal bone of the thumb attaches to the trapezium bone of the wrist. This joint is sometimes referred to as the basal joint of the thumb. The CMC Arthroplasty procedure includes the removal of the bone that is rubbing on the base of the thumb creating a space so as to improve the pain.
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