In abduction of the first carpometacarpal (CMC) joint, the first metacarpal would roll in a ____________________ direction and glide in a ____________________ direction on the trapezium
a. volar, dorsal
b. radial, ulnar
c. volar, volar
d. radial, radial
ANS: A
The saddle shape of the first CMC joint lends to different joint surface articulations in different planes of motion. In the sagittal plane, the joint produces the motion of abduction/adduction with the convex portion of the base of the first metacarpal moving on the concave portion of the trapezium. In the frontal plane, which allows for flexion and extension, the opposite relationship occurs between the joint surfaces.
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