Fig. 4 | Journal of Experimental Orthopaedics

Fig. 4

From: Distal radioulnar joint stabilization with open foveal reinsertion versus tendon graft reconstruction: an experimental study using radiostereometry

Fig. 4

Kinematic axis and anatomical landmarks. The distal radioulnar (DRUJ) position (D) was defined as the orthogonal projection (yellow arrow) from the radioulnar axis (red line) perpendicular to the radius sigmoid notch line (AB) connecting the anterior (A) and posterior (B) rim points. The DRUJ translation was calculated as the change of DRUJ position (D) on the sigmoid notch line (AB) in millimeters. The DRUJ postion ratio was calculated as AD/AB. Forearm rotation was calculated as; the angle between the line from the radial styloid tip (E) to the midpoint on the sigmoid notch line (AB), and the line from the ulnar head center (Cdist)  to the distal ulnar styloid tip (F)

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