Palmar Tilt represents the angle between a line joining the dorsal and volar margins of the articular surface and the long axis of the radius on a lateral xray.
It is also called Volar Angle or Radial Tilt.
The normal palmar tilt averages 11° and has a range of 2°-20°.
It is an important parameter in treatment of distal radius fractures.
Image Credit http://www.radiologyassistant.nl/en/476a23436683b