Table 5.

Summary of Changes of RD 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

		RD cephalad			RD caudal
	Distal	Middle	Proximal	Proximal	Middle	Distal
Motor tracts
TD	1.01 ± 0.23	1.01 ± 0.21	0.74 ± 0.20	0.87 ± 0.30	0.87 ± 0.31	0.76 ± 0.20
SCI	0.88 ± 0.31↓*	0.93 ± 0.17↓*	0.95 ± 0.22↑‡	0.86 ± 0.26	0.87 ± 0.23	0.77 ± 0.21
Sensory tracts
TD	0.69 ± 0.25	0.75 ± 0.21	0.69 ± 0.26	0.85 ± 0.44	0.93 ± 0.47	0.81 ± 0.26
SCI	0.72 ± 0.38	0.62 ± 0.20↓†	0.68 ± 0.19	0.83 ± 0.28	0.85 ± 0.32	0.71 ± 0.24

Unit for RD 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 with TD.

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

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