The basal joint (also known as the carpometacarpal joint or CMC joint) of the thumb is where the metacarpal bone of the thumb attaches to the trapezium bone of the wrist. It is...
The basal joint (also known as the carpometacarpal joint or CMC joint) of the thumb is where the metacarpal bone of the thumb attaches to the trapezium bone of the wrist. It is this joint that allows you to move your thumb into your palm, a motion called opposition. Several ligaments hold the joint together. These ligaments can be injured, such as when you sprain your thumb.
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