Overview
Rule of 11's
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AP WristNormal wrist AP the radial styloid should be about 1 cm above DRUJ Radial inclination 22 degrees Remember this when reducing fracture, pull it out to length. |
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Lateral WristOn the lateral view the distal radial articular surface normally points in a volar direction. Therefore if it is pointing dorsal it has already displaced by at least 11 degrees or more. |
Radial inclination
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a)DiBenedetto et al.: A and B 2
points bisecting radius 4 and 8 cm proximal to
radiocarpal joint to make line X. Line Y is drawn through
C, which is distal sigmoid notch, and D, which is the tip
of the radial styloid. Z is drawn perpendicular to line X
through point C. Radial inclination angle between lines Z
and Y. E is a point on line Z to allow radial height to
be measured between D and E. Radial inclination angle is
22° ± 3°. b)Matashita, Firrel, and Tsai. This method is a modification of that of DiBenedetto et al., in which the central axis (X) of the ulna is drawn through midpoints A and B at 2 cm and 4-5 cm proximal to the distal end of the ulna. |
Supplement 1 JBJS Vol 84 - A 2002 - Wrist terminology and definitions