As a saddle joint allows the biaxial movements bending / stretching and Abspreizen / Anwinkeln. Five Surgeries for Thumb Arthritis . The bone sitting on the saddle can move in an oval shape relative to the other bone, similar to a condyloid joint.
Carpometacarpal joint of thumb (Articulatio carpometacarpalis pollicis) The trapeziometacarpal joint is the articulation between the trapezium and the … Saddle joints provide stability to the bones while providing more flexibility than a hinge or gliding joint. 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. 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 only synovial joint in the body with the distinction of being considered a saddle joint is the carpometacarpal (CMC) joint in the thumb.

It is called a saddle joint because of the way the concave surface of the proximal head of the metacarpal articulates or sits on the convex surface of the trapezium bone, much like a rider setting an English saddle. Because of its relative instability, this joint is a frequent site for osteoarthritis. 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. The joint of the thumb is described at its own separate page The distal surfaces of the carpals of distal row articulate with all the bases of metacarpals. Functionally and medically, first carpometacarpal joint is the most essential carpometacarpal joint and for this reason described in detail latter.

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. In the combination of the two directions of rotation the thumb saddle joint acts almost like a ball joint.
Medical definition of saddle joint: a joint (as the carpometacarpal joint of the thumb) with saddle-shaped articular surfaces that are convex in one direction and concave in another and that permit movements in all directions except axial rotation. The Carpometacarpal Joint of the Thumb: Stability, Deformity, and Therapeutic Intervention Donald A. Neumann, PT, PhD1 Teri Bielefeld, PT, CHT2 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. The first carpometacarpal joint (Joint of the Thumb) is a saddle shaped joint while the remaining four are all synovial ellipsoid joints. The first carpometacarpal joint (Joint of the Thumb) is a saddle shaped joint while the remaining four are all synovial ellipsoid joints.


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