The trapezoid bone or lesser multangular bone is smallest bone in the distal row. [See fig].
It is s wedge-shaped and has having four articular facets touching each other, and separated by sharp edges.
Carpal Bones - Distal and Proximal Rows Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
Surfaces and Articulations
The superior surface, quadrilateral, smooth, and slightly concave, articulates with the scaphoid.
Left Trapezoid Bone, Greater Multangular is another name for trapezium. Navicular is another name for Scaphoid
The inferior surface articulates with the proximal end of the second metacarpal bone.
The dorsal and palmar surfaces are rough for the attachment of ligaments, the former being the larger of the two.
The lateral surface articulates with the trapezium.
The medial surface is concave and smooth in front, for articulation with the capitate rough behind, for the attachment of an interosseous ligament.
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