The carpometacarpal joints are the articulations between the distal row of carpals and the bases of the first through fifth metacarpals. The first carpometacarpal joint is the articulation between the first metacarpal and the trapezium. The second metacarpal articualtes primarily with the trapezoid and secondarily with the trapezium and capitate. The third metacarpal articulates with the capitate. The fourth metacarpal articulates with the capitate and hamate. The fifth metacarpal articulates with the hamate. Both the first and fifth carpometacarpal joints are saddle joints allowing primarily two degrees of freedom of movement. The second through fourth carpometacarpal joints are plane synovial joints allowing one degree of freedom of movement.
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Carpals | Metacarpals | Phalanges | Arches | Bone and Joint Structure | Help | Hand Kinesiology
Lorie Richards and Janice Loudon, October 1997