Background: Considerable between-center variability exists in the upper limit of normal (ULN) for the cross-sectional area (CSA) of the median nerve (MN) used to support the diagnosis of carpal tunnel syndrome (CTS). Objective: To evaluate whether a Dutch wrist circumference-dependent (WCD) equation for the ULN of MN CSA provides comparable classification of abnormal CSA in Italian and Dutch CTS populations. Methods: as WC in cm). Findings were compared with electrodiagnostic results. Results: < 0.0001). Conclusion: The WCD ULN for MN CSA yielded similar results in Italian and Dutch patients with CTS, and may be particularly useful in individuals with smaller wrists.
Dubbelink et al. (Thu,) studied this question.