What does the abbreviation 'CMC' refer to?

The abbreviation 'CMC' refers to the carpometacarpal joint, which is a critical joint in the hand located at the base of the thumb, connecting the carpal bones of the wrist to the metacarpal bone of the thumb. This joint is essential for a wide range of thumb movements, including grasping, pinching, and opposition, which are vital for hand function. Understanding the anatomical significance of the carpometacarpal joint is crucial for orthotic fitters, particularly when designing and fitting orthoses that may affect thumb mobility or stability.