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Table 5 Comparison of CSAs at the 8-points among the two most frequent positive sites and the negative site in the inching test

From: Ultrasonographic median nerve cross-section areas measured by 8-point "inching test" for idiopathic carpal tunnel syndrome: a correlation of nerve conduction study severity and duration of clinical symptoms

 

none (n = 119)

i4-i3 (n = 37)

i3-i2 (n = 55)

i 4

13.9 ± 4.8(7-40.8)

19.5 ± 6.9 (9-37)*

19.0 ± 6.9 (8-41)*

i 3

13.6 ± 4.8 (8-40.8)

17.4 ± 5.0 (8-32) *

17.9 ± 6.3 (8-42)*

i 2

12.0 ± 3.1 (8-29)

12.4 ± 3.1 (6-19)

13.2 ± 3.4 (8-25)

i 1

12.4 ± 4.1 (7-34.4)

13.6 ± 4.5 (7-31)

14.6 ± 4.3 (7.4-25)*

w

12.5 ± 4.0 (7-31)

14.5 ± 4.6 (7-27)

15.6 ± 4.9 (7-33)*

o 1

11.3 ± 2.8 (6-20.7)

13.1 ± 2.9 (9-20)

13.6 ± 3.6 (8-26)*

o 2

11.0 ± 2.4 (6-18.5)

12.2 ± 2.4 (8-18)

12.8 ± 2.7 (8-21.3)*

o 3

10.5 ± 2.6 (5-19)

10.5 ± 2.3 (6-16)

11.8 ± 2.4 (8-19)*

  1. Note: CSA, cross-section area; none, no conductive delay >0.4 ms in median inching test in centimeter across the carpal tunnel; i4-i3, conductive delay >0.4 ms in inching test between 4 cm and 3 cm distal to the wrist crease; i3-i2, conductive delay >0.4 ms in inching test between 3 cm and 2 cm distal to the wrist crease
  2. Markers of the 8-point: i4, i3, i2, i1, w, o1, o2, and o3
  3. i4-i3 and i3-i2: the difference of latency measured between locations of i4 and i3, and i3 and i2 in the inching test
  4. Unit of CSA = mm2
  5. *p < 0.05 in comparing the two most frequent positive sites and the negative one in inching test using analysis of variance (ANOVA) followed by Scheffe's multiple comparison procedure
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BMC Medical Imaging

ISSN: 1471-2342

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