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. 2016 Aug 24;45(11):1487–1493. doi: 10.1007/s00256-016-2455-y

Fig. 1.

Fig. 1

The radioulnar line method = CD/AB: the amount of ulnar head volar or dorsal from the ulnar line is measured (CD). The ratio of this length to the length of the sigmoid notch (AB) is calculated. Wrist in supination