The carpometacarpal (CMC) joints are five joints in the wrist that articulate the distal row of carpal bones and the proximal bases of the five metacarpal bones.

The base of the thumb where it meets the hand is called the carpometacarpal (CMC) joint. This joint lets the thumb move freely in many directions. It provides strength so the hand can grasp and grip. A smooth tissue called cartilage lines and cushions the bones of the CMC joint.

The carpometacarpal (CMC) of the thumb is a saddle joint that permits a wide range of motion and is largely responsible for the characteristic dexterity of human prehension. This joint, located at the very base of the thumb, is subject to large physical stresses throughout life.

The carpometacarpal (CMC) joints are synovial joints formed by articulations of the distal carpal row and the metacarpal bones. The carpometacarpal joints are made up of a number of bony articulations 1.