Diagnostic value of median nerve shear wave ultrasound elastography in diagnosis and differentiation of carpal tunnel syndrome severity

Egyptian Journal of Radiology and Nuclear Medicine

Table 2 Median nerve CSA, wrist-to-forearm ratio, and median nerve mean stiffness value by ultrasound elastography across controls and different CTS severity subgroups

Variable	Number	Mean ± SD	P value
Median nerve CSA (mm²)
Control	40	7.2 ± 1.82	0.01
CTS with normal NCS	6	9.56 ± 1.01
Mild	16	9.94 ± 1.29
Moderate	19	12.73 ± 1.64
Severe	15	13.12 ± 1.15
Wrist/forearm ratio
Control	40	1.6 ± 0.41	0.01
CTS with normal NCS	6	1.74 ± 0.76
Mild	16	1.98 ± 0.89
Moderate	19	2.79 ± 0.47
Severe	15	2.9 ± 0.28
Median nerve stiffness (kPa)
Control	40	38.13 ± 23.56	< 0.001
CTS with normal NCS	6	75.78 ± 17.19
Mild	16	81.64 ± 15.97
Moderate	19	110.42 ± 16.19
Severe	15	117.65 ± 14.84

^{CSA cross−sectional area, CTS carpal tunnel syndrome, kPa kilopascals, NCS nerve conduction studies}
^{*P value < 0.05 considered significant}