Lateral wrist radiograph: effect of pronation-supination
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As the distal radioulnar joint undergoes pronation-supination at the wrist level the radius can undergo rotation of up to 180° yet, the ulna will undergo limited to no movement within the arc of a circle( X1≒ X). To translate this into everyday terms, isolated rotation at the wrist from the PA position means the radius moves around a stationary distal ulna, resulting in a lateral view of the distal radius but not the ulna.
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