Scapho-lunate distance and cortical ring sign.
The scapho-lunate distance was measured on posteroanterior radiographs of 100 normal wrists. The scapho-lunate distance measured a mean of 3.7 mm +/- SD 0.6 (range from 2.5 to 5.0 mm). The mean for 44 male wrists was 4.0 mm, and for 56 female wrists it was 3.6 mm. These results indicate that a scapho-lunate distance of up to 5 mm is not necessarily indicative of carpal instability. None of these normal wrists had a scaphoid "cortical ring" sign.
Cautilli
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Pennsylvania Hand Center, Bryn Mawr 19010.
Wehbé
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D000886:Anthropometry; D002348:Carpal Bones / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D012016:Reference Values