Radius and Ulna

Wednesday, December 17th 2014. | Anatomy

Radius is a curved bone with an apex lateral bow with an apex lateral bow, radius & ulna lie parallel to each other when forearm is supinated and joined by proximal & distal RU joints & by interosseous membrane, which is directed obliquely downward from radius to ulna.

Ulna has a triangular shape throughout, with an apex posterior bow in the proximal third, the function al anatomy : average range of pronation/supination is 90/90 degrees (50/50 degrees necessary for activities of daily living) and middle third deformity has a greater effect on supination, with the distal third affecting pronation to a greater degree .


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