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  • General
    • The most lateral bone of the distal row of carbal bones.[1]
    • Located between the Scaphoid and the first metacarpal bone.
  • Anatomic Description
    • Palmar surface which contains a medial groove and prominent tubercle.
    • Dorsal surface is elongated and rough.
    • Lateral surface is large.
    • Medial surface is concave.
    • Dorso-lateral surface projects distally between the thumb and index metacarpals, has a facet articulating with the index metacarpal base.
    • Small concave proximal surface.


  • Articulations
    • Scaphoid at the mid-carpal joint.
    • Trapezoid at its inter-carpal joint.
    • Thumb metacarpal at the carpo-metacarpal joint of the thumb.
  • Ligament Attachments
    • Flexor Retinaculum
    • Radial collateral ligament
    • Capsule of the carpo-metacarpal joint of the thumb

Vascular Supply

Clinical Significance

See Also


  1. Doyle JR, Botte MJ. Surgical Anatomy of the Hand and Upper Extremity. Lippincott Williams & Wilkins. (2003) ISBN:0397517254
Created by:
Alaa Khader on 23 January 2022 15:53:24
Last edited:
24 January 2022 06:03:03