The Quantitative Assessment of Imaging Features for the Study of Hirayama Disease Progression

Table 2

At the cervical flexion position, the number of HD patients who had a significantly increased abnormal signal image posterior to the spinal cord is listed.

	C4-5			C5-6			C6-7			C7-T1
	Neutral position	Flexion position		Neutral position	Flexion position		Neutral position	Flexion position		Neutral position	Flexion position
Course <1 year
	—	—	0.79	—	—	0.88	—	1	0.94	—	—	0.19
	—	3	0.15	—	4	0.04	—	6	0.03	—	2	0.32
Course 1-2 years
	—	—	0.21	—	—	0.47	1	1	0.81	—	—	0.27
	—	4	0.00	—	9	0.02	—	12	0.00	—	1	0.09
Course 2-3 years
	—	1	0.70	—	—	0.49	—	—	0.06	—	—	0.64
	—	6	0.03	—	8	0.01	—	6	0.00	—	1	0.22
Course 3-4 years
	—	—	0.10	1	2	0.19	—	1	0.60	—	—	0.91
	—	5	0.00	—	9	0.00	—	6	0.00	—	—	0.15
Course >4 years
	—	—	0.49	—	1	0.50	1	2	0.68	—	—	0.32
	—	7	0.00	—	11	0.00	—	9	0.00	—	5	0.02