The carpometacarpal (CMC) joint (where the thumb's metacarpal bone meets the wrist) has a uniquely shaped bone (trapezium), allowing movement such as: Moving thumb toward the palm Circular ...

A major slip of the abductor pollicis longus based on the first metacarpal is incised proximal to the first dorsal compartment. At least one half of the total abductor pollicis longus tendon is ...