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*A line drawn between the distal ends of the articular surface of the radius.
*The axial plane of radius: Represented by a line that is perpendicular to the diaphysis of the radius.
Sometimes, the diaphysis of the radius is hard to distinguish from the [[ulna]], and a line between them (<font color="turquoise">turquoise line</font>) may be used instead.<ref>{{cite web|url=https://radiopaedia.org/articles/colles-fracture|title=Colles fracture|author=Dr Paresh K Desai|accessdate=2016-12-18|website=[[:en:Radiopedia|Radiopedia]]}}</ref>
Although this is the standard definition of dorsal or volar tilt, the parameter can be interpreted by clinicians as being in relation to the ''normal anatomical position'' of the articular surface of radius (which normally has a volar tilt of 11° to 12°), and should therefore be specified as shown in report.
