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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.

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