Stanford MSK Atlas of MSK Measurements

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DEFINITION:
Method of Perpendiculars - draw line along long axis of the radius (light line). draw line perpendicular to this, through the ulnar corner of the radius (dark line).

ABNORMAL:
if < 0 mm then negative ulnar variance, associated with keinbock
if > 0 mm then positive ulnar variance, associated with ulnar abutment syndrome

RADLEX:
wrist ( RID2177 )

how to draw the ulnar variance