Sensitivity and Specificity of Colour Duplex Ultrasonography

The accuracy of colour duplex USG in detecting SFJ and SPJ incompetence was 100%, while 92 perforators could be detected out of 104 by this modality (88.4% sensitivity) and 12 sites were missed, which were situated mainly in the lower part of the leg. By colour duplex sonography, a total of 100 sites were marked as incompetent perforators, out of which 92 were found correct on exploration (92% specificity). So, for perforator incompetence, colour duplex USG missed detection of 12 perforator sites, and 8 sites were marked wrongly as false positive (Table II).

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