The articular disc of the inferior radio-ulnar joint covers the head of the ulna and is attached to the base of the ulnar styloid process. This disc, together with the distal end of the radius, form the proximal face of the wrist joint, the distal surface being the proximal articular surfaces of the scaphoid, lunate and triquetral.
The wrist is a condyloid joint—that is to say, it allows flexion, extension, abduction, adduction and circumduction, the last being a combination of the previous four. Flexion and extension are increased by associated sliding movements of the intercarpal joints; although the range of flexion at the wrist is actually less than that of extension, these associated movements make it apparently greater.
Because of the greater distal projection of the radial styloid, the range of abduction at the wrist is considerably less than that of adduction.
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