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The articulations between the carpus and the metacarpal bones are so constructed as to make complete luxations of these joints somewhat rare. From a surgical point of view these articulations are divided into two parts: first, the articulation of the multangulum majus (older terminology, trapezium) with the first metacarpal; second, the articulation between the inner four metacarpals and the carpus. The latter acts functionally as one continuous joint, having a synovial membrane in common. This union is of the arthroidal type, while the carpometacarpal joint of the thumb is one of reciprocal reception and is capable of motion in all direction, except axial rotation.
This joint is separate from the other set, is surrounded by a strong separate capsule, and has its own synovial membrane. Although dislocations at this point are more common than at the other carpometacarpal joints, of the cases reported very few have been forward, backward luxation
BERRY EL. COMPLETE FORWARD LUXATION OF CARPOMETACARPAL ARTICULATION OF THUMBREPORT OF A CASE. JAMA. 1917;LXVIII(3):190. doi:10.1001/jama.1917.04270010190011