Table 2 Comparison of FA values between the affected side and uninjured side nerve roots.

From: Utility of diffusion tensor imaging for guiding the treatment of lumbar disc herniation by percutaneous transforaminal endoscopic discectomy

FA Values

Pre-op

3 days post-op

30 days post-op

90 days post-op

P (2-tailed)

FA (L5)

affected side

0.354 ± 0.031a

0.379 ± 0.029ab

0.408 ± 0.035bc

0.421 ± 0.018c

<0.001#

uninjured side

0.448 ± 0.037

0.479 ± 0.042

0.462 ± 0.036

0.442 ± 0.034

—

P (2-tailed)

<0.001$

0.001$

0.008$

0.38$

—

FA (SI)

affected side

0.359 ± 0.023a

0.367 ± 0.033a

0.383 ± 0.031a

0.437 ± 0.024b

<0.001#

uninjured side

0.460 ± 0.029

0.454 ± 0.039

0.458 ± 0.040

0.445 ± 0.025

—

P (2-tailed)

<0.001$

<0.001$

<0.001$

0.134$

—

  1. FA indicated fractional anisotropy. #, repeated measurement analysis of variance. $, paired t-test. Multiple comparisons of each variable at different time points were used bonferroni method, and at least one identical subscript letter (a, b and c) denoted no significant difference from each other.
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