Purpose: Diabetes mellitus (DM) and carpal tunnel syndrome (CTS) are common pathologies. The diagnosis of CTS can be facilitated by the use of an ultrasound-based wrist-to-forearm ratio (WFR) of the nerve diameter. However, the applicability of WFR in DM-patients is not yet clear.
Materials And Methods: 233 wrists of 153 patients were examined. Cross-sectional areas (CSA) of the median nerve were obtained using a linear array probe. The WFR was calculated.
Results: Diabetics with CTS had significantly lower WFR values than non-diabetics with CTS (p = 0.002). There was no difference between the WFR of diabetics with and without CTS (p = 0.06). The diagnostic accuracy between diabetics with and without CTS was low for measurements of WFR (ROC AUC = 0.630, 95 % CI 0.541 - 0.715, p = 0.011).
Conclusion: Our findings suggest that the WFR has a low diagnostic accuracy in diabetic patients with CTS and should be used with caution in those patients.
Key Points: · The diagnostic accuracy of WFR is low in patients with DM. · WFR should not be used in patients with DM. · The sonographic evaluation of the median nerve in patients with DM should focus on morphological changes.
Citation Format: · Steinkohl F, Loizides A, Gruber L et al. Ultrasonography for the Diagnosis of Carpal Tunnel Syndrome in Diabetic Patients: Missing the Mark?. Fortschr Röntgenstr 2019; 191: 117 - 121.
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