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. 2022 Apr 21;7(4):287–294. doi: 10.1530/EOR-21-0087

Figure 1.

Figure 1

The ulnar bow sign. A dorsal line is drawn from olecranon to the distal edge of the ulna on a lateral view, and any point on the ulnar shaft surpassing this line for over 1 mm indicates a curvature in the ulna.