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  • General
    • Known as the triangular bone and has a pyramidal shape.[1]
    • Forms part of the proximal carpal row.
    • Located between the Lunate and the Pisiform.
  • Anatomic Description
    • Superior surface has a medial non-articular portion, and a lateral convex portion that articulates with the Articular disk of the wrist.
    • Inferior surface is directed lateralward, and it articulates with the Hamate.
    • Dorsal surface is rough for the attachment of ligaments.
    • Lateral surface which is the base of the pyramid is for the articulation with the Lunate.
    • Medial surface the apex of the pyramid is for the attachment of the Ulnar Collateral Ligament of the wrist.


  • Articulations
  • Ligament Attachments
    • Luno-triquetral ligament
    • Ulno-triquetral ligaments
    • Ulnar collateral ligament

Vascular Supply

  • Network of nutrient vessels on non-articular surfaces.

Clinical Significance

See Also


  1. DSc SSP. Gray's Anatomy. Churchill Livingstone. (2011) ISBN:0443066841
Created by:
Alaa Khader on 23 January 2022 15:51:57
Last edited:
23 January 2022 16:30:24