Positive ulnar variance
Disclosures
- updated 3 May 2023:
- Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)
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Positive ulnar variance describes where the distal articular surface of the ulna is more than 2.5 mm distal to the articular surface of the radius.
It plays important role in wrist pathology such as ulnar impaction syndromes and and thinning of the triangular fibrocartilage complex.
Radiographic features
Maximum forearm pronation results in an increase in positive ulnar variance, whereas maximum forearm supination decreases ulnar variance 1.
See also
-<p><strong>Positive ulnar variance</strong> describes where the distal articular surface of the ulna is more than 2.5 mm distal to the articular surface of the radius. </p><p>It plays important role in wrist pathology such as <a href="/articles/ulnar-impaction-syndrome">ulnar impaction syndromes</a> and thinning of the <a href="/articles/triangular-fibrocartilage-complex">triangular fibrocartilage complex</a>.</p><h4>Radiographic features</h4><p>Maximum forearm pronation results in an increase in positive ulnar variance, whereas maximum forearm supination decreases ulnar variance <sup>1</sup>.</p><h4>See also</h4><ul>- +<p><strong>Positive ulnar variance</strong> describes where the distal articular surface of the ulna is more than 2.5 mm distal to the articular surface of the radius. </p><p>It plays important role in wrist pathology such as <a href="/articles/ulnar-impaction-syndrome">ulnar impaction syndromes</a> and thinning of the <a href="/articles/triangular-fibrocartilage-complex">triangular fibrocartilage complex</a>.</p><h4>Radiographic features</h4><p>Maximum forearm pronation results in an increase in positive ulnar variance, whereas maximum forearm supination decreases ulnar variance <sup>1</sup>.</p><h4>See also</h4><ul>
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Figure 2: ulnar variance (illustration)
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Image 4 X-ray (Frontal) ( update )
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Image 5 Annotated image (Frontal) ( update )
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