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Measurement of DIPJ radial-ulnar deviation on the coronal plane. The yellow line represents the longitudinal axis of the middle phalanx. The red line represents the longitudinal axis of the distal phalanx. The white dotted circle shows the best-fit circle to the head of the middle phalanx. The red dotted circle shows the best-fit circle to the head of the distal phalanx. The joint radial-ulnar deviation is the angle between the red line and the yellow line
