Lower extremity of radius

Lower Extremity Of Radius

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Lower extremity of radius

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

Articular surfaces

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

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




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