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This diagram shows how to draw the capitolunate angle which should be less than 30 degrees, and scahpolunate angle (which is generally drawn on plain film) which should be less than 60 degrees.
The axis of the lunate is drawn as a perpendicular to a line connecting the to poles for both measurements.
A line is drawn along the axis of the capitate, through the apex of the proximal artiular surface as a best fit line for the capitolunate angle.
A tangent is drawn along the volar surface of the scaphoid for the scapholunate angle.