The hamate bone (unciform bone) is a wedge-shaped bone and has a hook-like process which projects from its volar surface. It is situated at the medial most side of distal row of carpal bones. It has a downward base that rests on the 4thand 5th metacarpal bones, and apex is directed upward and lateralward.
In Latin hamatus means hooked.
The superior surface, the apex of the wedge, is narrow, convex, smooth, and articulates with the lunate.
Carpal Bones - Distal and Proximal Rows Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
The inferior surface articulates with the fourth and fifth metacarpal bones, by concave facets which are separated by a ridge.
The dorsal surface is triangular and rough for ligamentous attachment.
Left Hamate Bone
The volar surface presents, at its lower and ulnar side, a curved, hook-like process, the hamulus, directed forward and lateralward.
The medial surface articulates with the triquetral bone by an oblong facet, cut obliquely from above, downward and medialward.
The lateral surface articulates with the capitate by its upper and posterior part, the remaining portion being rough, for the attachment of ligaments
Hamate bone fracture is a common injury in baseball players. Radiological identification of hamate is used to do estimation of age.
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