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DOI:10.2214/AJR.06.1599
AJR 2007; 188:W575
© American Roentgen Ray Society

Reply

Arthur De Smet and Michael Tuite

University of Wisconsin School of Medicine and Public Health Madison, WI



 
WEB—This is a Web exclusive article.

We appreciate the careful reading of our article [1] by Drs. Lee, Tzeng, and Lin and welcome the opportunity to further discuss our findings. As they noted [2], we indicated in Table 2 of our article that we excluded the possibly torn cases in the statistical calculations for menisci diagnosed as torn using the two-slice-touch rule [1].

We presented the data in this manner to emphasize how we view this category—as two different diagnostic groups and not as two different criteria for diagnosing a tear. Thus, a meniscal tear is much more likely to be present if there are two or more abnormal MR images than if there is only one. For this reason, we presented the table to summarize the statistics in two groups: those with two or more abnormal images and those with one or more abnormal images.

However, we certainly agree that if one considers the criteria for a tear to be first one or more abnormal images and then two or more abnormal images, then the statistics as calculated in their letter [2] are correct. It is important for readers to note that the magnitude of the differences between our calculations and theirs as to sensitivity, specificity, and negative predictive value are small, with no change in the statistically significant differences.


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  1. De Smet AA, Tuite MJ. Use of the "two-slice-touch" rule for the MRI diagnosis of meniscal tears. AJR2006; 187:911 –914[Abstract/Free Full Text]
  2. Lee C-H, Tzeng C-Y, Lin Y-M. Specificity gains at the expense of sensitivity and vice versa (letter). AJR2007; 188:W574[Free Full Text]

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This Article
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