Table 5:

Features of internal derangement—summary of all discs

Disc State	Discogram Pain Response
	Severe Pain
	Concordant			Discordant			Negative for Pain			Total
	RDef	DEG	Nl	RDef	DEG	Nl	RDef	DEG	Nl	RDef	DEG	Nl	All
EAF	9	13	0	6	4^{^a}	0	3	4	0	18	21	0	39
Focal high-signal T2 only	0	0	0	0	0	0	0	0	1	0	0	1	1
No annular fissure	6	5	3	2	1	1	7^{^b}	7^{^c}^,^{^d}	28	15	13	32	60
Total	15	18	3	8	5	1	10	11	29	33	34	33	100

Note:—Nl indicates normal-appearing disc on postdiscogram CT.
↵a One Dallas Grade 1 disc.
↵b One Dallas Grade 1 radial fissure.
↵c One Dallas Grade 2 disc.
↵d One Dallas Grade 1 disc; 1 Dallas Grade 2 disc.