Ulnar nerve involvement at the wrist in idiopathic mild to moderate carpal tunnel syndrome: electrophysiological and ultrasonographic study

Egyptian Rheumatology and Rehabilitation

Table 3 Comparison between the two studied groups according to ultrasonographic parameters

Ultrasonography	Cases (n = 40)	Control (n = 40)	Test of Sig	P
m-CSA at pisiform (mm²)
Min.–max	9.0–17.0	6.0–9.0	t = 13.805	< 0.001
Median (IQR)	12.0 (11.0–14.0)	7.0 (6.0–8.0)	t = 13.805	< 0.001
∆m-CSA
Min.–max	1.0–8.0	0.0–2.0	U = 65.0	< 0.001
Median (IQR)	3.0 (2.50–4.0)	1.0 (1.0–1.0)	U = 65.0	< 0.001
m- SR
Min.–max	1.10–2.70	0.85–1.80	U = 73.0	< 0.001
Median (IQR)	1.50 (1.39–1.56)	1.14 (1.0–1.20)	U = 73.0	< 0.001
m-FR
Min.–max	2.0–5.70	2.08–4.50	t = 2.389	0.019
Median (IQR)	3.20 (2.65–3.40)	2.80 (2.50–3.10)	t = 2.389	0.019
u-CSA (mm²)
Min.–max	3.0–8.0	2.0–4.0	t = 9.017	< 0.001
Median (IQR)	5.0 (4.0–6.0)	3.0 (3.0–4.0)	t = 9.017	< 0.001

Bold values indicate statistical significance at p ≤ 0.004 (After statistical correlation by Bonferroni test)
CSA cross-sectional area, m-SR median swelling ratio, m-FR median flattening ratio, m median nerve, u ulnar nerve, IQR interquartile range, t Student t-test, U Mann–Whitney test, p p value for comparing between the two studied groups