Boyer diss 2009 1046..

Hamate
Description.—The left hamate is preserved. In dorsal view it is the shape of a
right triangle with the distal and radial surfaces forming legs of the “triangle,” and the
ulnar surface forming the hypotenuse (Table 4.9; Figs. 4.11C, 13). The distal surface for
the fourth and fifth metacarpals is dorsoventrally concave. It has a surface area of 10.7
mm. In distal view the distal articular surface is “trapezoid” shaped: the dorsal margin is
radioulnarly wider than the ventral margin. The maximum radioulnar width of the dorsal
margin of the distal surface is slightly narrower than the dorsoventral depth of the distal
surface. The ulnar surface is gently convex and articulated with both the triquetrum
(distally) and lunate (proximally), and possibly even the capitate in some postures
(proximally and radially), although there is no clear demarcation between regions
touched by one bone versus the other. The distal margin of the triquetrum facet has a lip
protruding beyond it, which would have served to limit radial translation of the hamate
with respect to the triquetrum. The radial surface of the hamate (for articulation of the
capitate) is proximodistally concave. Toward its proximal base, the radial surface is
dorsoventrally convex. This convexity appears to be the boundary between the capitate
facet, which occupies the more ventral part of the radial side, and an accessory facet
dorsal to it that faces slightly dorsad (Fig. 4.13B: 5). The proximal surface has a narrow
facet that extends onto the ventral surface and appears to have received the scaphoid in
certain postures (Fig. 4.13B: 3). On either side of the ventral expression of the scaphoid
facet, nutrient foramina separate it from the other ulnar and radial surface facets.
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