Isolated thumb carpometacarpal (CMC) dislocations without any other concomitant injury are rare and account for <1% of all hand injuries. The bone sitting on the saddle can move in an oval shape relative to the other bone, similar to a condyloid joint.


The 1st CMC (carpometacarpal) joint is a specialized saddle-shaped joint at the base of the thumb. The articulation takes place between the carpus and second to fifth metacarpal bones.

This joint is formed by the trapezium bone of the wrist and the first metacarpal bone of the thumb.
Thumb carpometacarpal (CMC) joint osteoarthritis (OA) is the second most common form of hand OA, affecting between 20% and 30% of the general population. In the combination of the two directions of rotation the thumb saddle joint acts almost like a ball joint. The carpometacarpal joint of the thumb is more complex than the other carpometacarpal joints. The distal surfaces of the carpals of distal row articulate with all the bases of metacarpals. This carpometacarpal joint of the human thumb makes it opposable and allows it to span across the … The articulation takes place between the carpus and second to fifth metacarpal bones. Carpometacarpal joint.

Joint pain stemming from the 1st CMC joint is one of the most common areas in the hand to develop arthritis, which is inflammation and pain resulting from cartilage loss. 3 While CMC arthroplasty and fusion are options for patients, they may …

The trapezium bone is shaped like a saddle in the area of the thumb saddle joint. CMC joint osteoarthritis is traditionally viewed as a disease endemic in postmenopausal women. The CMC of the thumb differs significantly from the other four CMCs and is therefore described separately.

Because of its relative instability, this joint is a frequent site for osteoarthritis.

1,2 Thumb CMC joint OA is more prevalent in females than males, increases with age, and has been associated with hand pain and loss of functional hand use. The only synovial joint in the body with the distinction of being considered a saddle joint is the carpometacarpal (CMC) joint in the thumb. Functionally and medically, first carpometacarpal joint is the most essential carpometacarpal joint and for this reason described in detail latter.

The first carpometacarpal joint (Joint of the Thumb) is a saddle shaped joint while the remaining four are all synovial ellipsoid joints.

It is located roughly 1 inch (2.54 cm) above the wrist at the base of the thumb, between the carpal bones and the metacarpal bones. There are five CMC joints in total, out of which the carpometacarpal joint of thumb (trapeziometacarpal joint) is the most specialized and flexible. Why is carpometacarpal …

3 The thumb CMC joint is stabilized by its joint capsule and the palmar oblique, first intermetacarpal, dorsal radial, and posterior oblique ligaments.

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.

2019. anatomy; The thumb saddle joint connects the metacarpal bone of the thumb with the trapezoidal polygonal bone. As a saddle joint allows the biaxial movements bending / stretching and Abspreizen / Anwinkeln.


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