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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 CMC joint of the thumb or the first CMC joint, also known as the trapeziometacarpal (TMC) joint, differs significantly from the other four CMC joints and is therefore described separately.
The first metacarpal bone is short and thick with a shaft thicker and broader than those of the other metacarpal bones. Its narrow shaft connects its widened base and rounded head; the former consisting of a thick cortical bone surrounding the open medullary canal; the latter two consisting of cancellous bone surrounded by a thin cortical shell.
The CMC joint of the thumb allows a wide range of motion while maintaining stability for grasp and pinch. [citation needed] With this in mind, failure to properly recognize and treat the Bennett fracture will not only result in an unstable, painful, arthritic CMC joint with diminished range of motion: it will also result in a hand with greatly ...
The TMC joint is a synovial joint between the trapezium bone of the wrist and the metacarpal bone at the base of the thumb. This joint is a so-called saddle joint (articulatio sellaris), unlike the CMC joints of the other four fingers which are ellipsoid joints. [17] This means that the surfaces of the TMC joint are both concave and convex.
[1] [3] Joint replacement surgery may be an option if there is ongoing disability despite other treatments. [2] An artificial joint typically lasts 10 to 15 years. [11] Osteoarthritis is the most common form of arthritis, affecting about 237 million people or 3.3% of the world's population as of 2015. [4] [12] It becomes more common as people ...
Image credits: Jessica Koby His recovery included a groundbreaking 23-hour face and double hand transplant in 2020 at NYU Langone Health, making him the first person to successfully undergo such a ...
Besides the metacarpophalangeal joints, the metacarpal bones articulate by carpometacarpal joints as follows: the first with the trapezium; the second with the trapezium, trapezoid, capitate and third metacarpal; the third with the capitate and second and fourth metacarpals; the fourth with the capitate, hamate, and third and fifth metacarpals;
Twin brothers who were born conjoined, sharing part of their sternum, diaphragm, abdominal wall and liver, recently celebrated their first birthday after undergoing successful separation surgery.