Table 3.

Summary of Changes of AD in the Motor and Sensory Tracts of the Segments of the SC Cephalad and Caudal to the Level of MRI Lesion in TD and SCI Subjects

		AD cephalad			AD caudal
	Distal	Middle	Proximal	Proximal	Middle	Distal
Motor tracts
TD	2.15 ± 0.31	2.11 ± 0.28	1.59 ± 0.38	1.80 ± 0.51	1.84 ± 0.41	1.49 ± 0.32
SCI	1.96 ± 0.30↓†	1.87 ± 0.25↓‡	1.76 ± 0.31↑*	1.47 ± 0.42↓†	1.61 ± 0.35↓*	1.44 ± 0.35
Sensory tracts
TD	1.81 ± 0.33	1.78 ± 0.30	1.59 ± 0.40	1.87 ± 0.62	2.02 ± 0.61	1.48 ± 0.36
SCI	1.81 ± 0.37	1.62 ± 0.26↓†	1.48 ± 0.29	1.45 ± 0.38↓‡	1.70 ± 0.42↓†	1.41 ± 0.47

Unit for AD is given in 10⁻³ mm²/s.

Bold indicates significantly different DTI value in SCI subjects than in TD.

↓ indicates decreased DTI value; ↑ indicates increased DTI value in SCI compared to TD.

^†p < 0.01, ‡p < 0.001, ^*p < 0.05 indicates significant difference from TD.

AD, axial diffusivity; SC, spinal cord; MRI, magnetic resonance imaging; TD, typically developing; SCI, spinal cord injury.