Effects of wrist extension on median nerve and flexor tendon excursions in patients with carpal tunnel syndrome: a case control study

Table 4 Comparison of the ratio of median nerve excursion to flexor tendon excursion between finger flexion and extension phases in patients with carpal tunnel syndrome (CTS) and healthy volunteer, while performing flexion and extension movements of index finger at a speed of one cycle per second

Variables	CTS hands (n = 79)	Healthy hands (n = 88)	p- value^b
Variables	Mean±SD	Mean±SD	p- value^b
Ratio of median nerve/flexor tendon excursion in wrist neutral position
Flexion phase	0.22±0.11	0.30±0.16	0.0009
Extension phase	0.18±0.10	0.27±0.15	0.0004
p- value^a	0.001	0.001
Ratio of median nerve/flexor tendon excursion in wrist extended position
Flexion phase	0.23±0.14	0.31±0.16	0.0029
Extension phase	0.20±0.12	0.27±0.14	0.0024
p- value^a	0.007	0.004

^acomparison between wrist at neutral and extended positions (Wilcoxon Signed Ranks test)
^bcomparison between CTS patients and healthy volunteers after adjusting for age and gender (generalized estimating equation)

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