Orthopaedics PGI December 2012 – Distal Radius Anatomy

Q. Which of the following is(are) not correct regarding the articular surface of radius?
a. radial tilt of 11 degrees
d. Radial tilt of 22 degrees
c. Radial inclination of 11 degrees
d. Radial inclination of 22 degrees
e. Length 24 mm –

Answer –

Explanation :

Radial Height : Radial height is assessed on the PA view. It is a measurement between 2 parallel lines that are perpendicular to the long axis of the radius. One line is drawn on the articular surface of the radius, and the other is drawn at the tip of the radial styloid. The normal radial height is 9.9-17.3 mm.Measurements of less than 9 mm in adults suggest the presence of comminuted or impacted fractures of the radial head. Comparison with the contralateral normal wrist is recommended if the diagnosis is unclear .

Radial Inclination : Radial inclination is measured on the PA view; this is a measurement of the radial angle. A line is drawn along the articular surface of the radius perpendicular to the long axis of the radius, and a tangent is drawn from the radial styloid. The normal angle is 15-25º.

Radial Tilt : The volar tilt, or palmar inclination, is measured on the lateral view. A line perpendicular to the long axis of the radius is drawn, and a tangent line is drawn along the slope of the dorsal-to-palmar surface of the radius. The normal angle is 10-25º.A negative volar tilt indicates dorsal angulation of the distal, radial articular surface.