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.

;Other surfacesThis end of the bone has three non-articular surfaces - volar, dorsal, and lateral.
* The volar surface, rough and irregular, affords attachment to the volar radiocarpal ligament.
* The dorsal surface is convex, affords attachment

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