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Diagnostic efficacy of high-frequency Grey-scale ultrasonography and Sono-elastography in grading the severity of carpal tunnel syndrome in comparison to nerve conduction studies

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Abstract

Objectives

To correlate the cross-sectional area (CSA) and elasticity of the median nerve (MN) measured at carpal tunnel inlet between healthy controls and various degrees of carpal tunnel syndrome (CTS) graded as per nerve conduction studies (NCS).

Materials and methods

A total of 53 patients (with 81 wrists) presenting with clinical symptoms characteristic of CTS, having their diagnosis confirmed and severity graded by NCS, and 48 healthy controls (with 96 wrists) were included in the study. All the study participants underwent wrist ultrasound which included initial Grey-scale USG followed by strain and shear wave elastography. The CSA and elasticity (in terms of strain ratio and shear modulus) of MN were measured at the carpal tunnel inlet. Statistical analysis was performed using the Mann–Whitney U test to compare between the two groups and for subgroup analysis of cases. The diagnostic performance of each variable was evaluated using the receiver operating characteristic curves.

Results

The mean CSA was 9.20 ± 1.64, 11.48 ± 1.05, 14.83 ± 1.19 and 19.87 ± 2.68 mm2, the mean shear modulus was 17.93 ± 2.81, 23.59 ± 2.63, 32.99 ± 4.14 and 54.26 ± 9.24 kPa and the mean strain ratio was 5.26 ± 0.68, 5.56 ± 0.70, 7.03 ± 0.47 and 8.81 ± 0.94 in control, mild, moderate and severe grades of CTS, respectively (p < 0.001).

Conclusion

The combined utility of Grey-scale USG and Elastography may serve as a painless and cost-effective alternative to NCS in grading the severity of CTS.

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Authors and Affiliations

  1. Department of Radiology, Bangalore Medical College and Research Institute, Bangalore, Karnataka, India

    Arjun Prakash, H. Vinutha, R. Mohit Mouna, P. S. Sushmitha, Shantkumar Sajjan & H. Samanvitha

  2. Department of Neurology, Bangalore Medical College and Research Institute, Bengaluru, India

    D. C. Janardhan

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  1. Arjun Prakash
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  2. H. Vinutha
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  3. D. C. Janardhan
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  4. R. Mohit Mouna
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Correspondence to H. Vinutha.

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Prakash, A., Vinutha, H., Janardhan, D.C. et al. Diagnostic efficacy of high-frequency Grey-scale ultrasonography and Sono-elastography in grading the severity of carpal tunnel syndrome in comparison to nerve conduction studies. Skeletal Radiol (2024). https://doi.org/10.1007/s00256-024-04662-y

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