The significance of ultrasonographic carpal tunnel outlet measurements in the diagnosis of carpal tunnel syndrome

High resolution ultrasonography (HRUS) was first implemented as a diagnostic tool in carpal tunnel syndrome (CTS) in the early 1990s (Buchberger et al., 1991, 1992). The meta-analyses of the large body of literature that has accumulated in the past two decades (Cartwright et al., 2012; Tai et al., 2012) showed that level A evidence support the ultrasonographic measurement of median nerve cross-sectional area at the tunnel inlet (CSA-I) as an accurate diagnostic test for CTS (Cartwright et al., 2012).

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