Triquetrum

Description

• General
  • Known as the triangular bone and has a pyramidal shape.
  • 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.

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Actions

• Articulations
  • Scaphoid and Lunate forming the distal articular surface of the radio-carpal joint.
  • Lunate lateral
  • Pisiform lateral
  • Hamate distal
• Ligament Attachments
  • Luno-triquetral ligament
  • Ulno-triquetral ligaments
  • Ulnar collateral ligament

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Vascular Supply

• Network of nutrient vessels on non-articular surfaces.

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Clinical Significance

• Triquetrum Fracture
• Lunotriquetral Instability

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See Also

• Hand and Wrist Anatomy (Main)
• Hand And Wrist Anatomy
• Wrist Pain (Main)

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