Hamate bone

The hamate bone or Hamato is a paired, short and spongy wrist bone, pyramidal in shape, with six faces, four of which are articular.

It is the fourth bone, from radial to ulnar, of the second carpal row. It articulates with the triquetrum, large carpi, lunate, and fourth and fifth metacarpals. He is the last one in the second row. On its anterior face there is a long unciform process, hook-shaped, at the apex of which the anterior carpal ligament is fixed. Its posterior face is rough. Its superior, articular face seems more like an obtuse edge, for the lunate. Its lower face has two facets for the last two metacarpals. Its external face is articular for the large bone. Its internal face, also articular in almost its entire extension for the triquetrum.

Surfaces

• La upper surface, the vertex of the wedge, is narrow, convex, smooth, and is articulated with the semi-lunar.
• La lower surface is articulated with the fourth and fifth metacarpal bones, by concave facets that are separated by a crest.
• La dorsal surface is triangular and irregular for ligament fixing.
• La surface It presents, in its lower and cubital part, a bending process, the hook hook, directed forward and lateral.
• La medial surface it is articulated with the pyramidal bone by a rectangular face, cut obliquely from above, down and medial.
• La side surface it is articulated with the large bone on its upper and later, the remaining part is in gross, for the binding of the ligaments.