Lower extremity of radius

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Distal radius
The radius and ulna of the left forearm, posterior surface. The top is proximal (elbow) and bottom is distal (wrist).
Latin Extremitas distalis radii
Gray's p.220
FMA 33776
Anatomical terms of bone

The distal end of the radius is large and of quadrilateral form.

Articular surfaces[edit]

It is provided with two articular surfaces - one below, for the carpus, and another at the medial side, for the ulna.

  • The carpal articular surface is triangular, concave, smooth, and divided by a slight antero-posterior ridge into two parts. Of these, the lateral, triangular, articulates with the scaphoid bone; the medial, quadrilateral, with the lunate bone.
  • The articular surface for the ulna is called the ulnar notch (sigmoid cavity) of the radius; it is narrow, concave, smooth, and articulates with the head of the ulna.

These two articular surfaces are separated by a prominent ridge, to which the base of the triangular articular disk is attached; this disk separates the wrist-joint from the distal radioulnar articulation.

Non-articular surfaces[edit]

This end of the bone has three non-articular surfaces - volar, dorsal, and lateral.

Additional images[edit]


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)