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. Author manuscript; available in PMC: 2007 Sep 20.
Published in final edited form as: J Hand Surg Am. 2002 Nov;27(6):991–1002. doi: 10.1053/jhsu.2002.35878

Figure 15.

Figure 15

Effect of radiographic arm position on gap measurement between scaphoid and lunate. (A) An apparently small gap could be measured from a radiograph with the forearm slightly rotated so that the radiograph is not a true posteroanterior x-ray. (A and B) Here a simulated whole arm rotation of 10° would suggest a gap of 2.4 mm, labeled as “Z” on the figure, whereas the true minimum distance is 3.8 mm as seen in B as “X” and in Fig. 14A as “X.” In some views part of the minimum distance line may be hidden by the scaphoid or lunate.