Ratio and difference of the cross-sectional area of median nerve to ulnar nerve in diagnosing carpal tunnel syndrome: a case control study

Table 3 Comparison of sonographical findings between hands with CTS and healthy hands

	CTS patients (hands =56)	healthy volunteer (hands =59)	P value^*
	Mean (SD)	Mean (SD)
CSA-P of median nerve (mm²)	11.3 (4.4)	8.8 (2.2)	< 0.0001
CSA-DRUJ of median nerve (mm²)	8.2 (2.9)	7.4 (1.7)	0.04
CSA-P of ulnar nerve (mm²)	3.1 (1.1)	3.5 (1.4)	0.08
Flattening ratio of median nerve	2.5 (0.7)	2.6 (0.9)	0.64
Swelling ratio	1.5 (0.9)	1.2 (0.3)	0.04
MUR	4.1 (2.3)	2.9 (1.5)	0.0206
MUD	8.2 (4.3)	5.3 (2.0)	< 0.0001

Abbreviations: CTS carpal tunnel syndrome, CSA-P cross-sectional area at the pisiform level, CSA-DRUJ cross-sectional area at the distal radioulnar joint level, MUR median-to-ulnar nerve ratio, MUD median-to-ulnar nerve difference
^*: comparison of differences between groups after adjusting for age, gender and body mass index (generalized estimating equation)

ISSN: 1471-2342