What is the anatomy of the distal radius relation to ulnar-sided wrist pain?

Updated: Apr 26, 2021
  • Author: David M Lichtman, MD; Chief Editor: Harris Gellman, MD  more...
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The distal articular surface of the radius has an average radial inclination or slope of 22°, and it tilts palmarly by an average of 11°. The distal radius has a biconcave articular surface with two articular facets that are separated by an anterior and a posterior ridge. The lateral scaphoid facet is triangular, whereas the medial lunate facet is quadrilateral. The ulnar aspect of the radius has a concavity: the sigmoid notch, which articulates with the convex semicircular head of the distal ulna.

The distal radioulnar joint (DRUJ) is the articulation of the distal radius and ulnar head. [3] When the DRUJ is considered, it is important to note that the radius prosupinates upon the ulna. In both pronation and supination, the radius shortens (pronation) and lengthens (supination) in relation to the ulna. In the neutral position, the lengths of the radius and ulna should not differ by more than 1 mm.

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