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TABLE 1: Rotations at each lumbar level in the control subjects
Subject No. Level Rotation (degrees) MR Appearance of Intervertebral Disk
1 L1-L2 −1.0 Normal
L2-L3 2.1 Normal
L3-L4 1.8 Normal
L4-L5 0.8 Normal
L5-S1 0.8 Normal
2 L1-L2 −0.5 Normal
L2-L3 0.3 Normal
L3-L4 1.7 Normal
L4-L5 −0.4 Normal
L5-S1 1.9 Normal
3 L1-L2 0.5 Normal
L2-L3 0.8 Normal
L3-L4 −0.1 Normal
L4-L5 1.3 Normal
L5-S1 2.6 Normal
4 L1-L2 0.1 Normal
L2-L3 0.9 Normal
L3-L4 1.0 Normal
L4-L5 1.3 Normal
L5-S1 1.2 Normal
5 L1-L2 3.0 Normal
L2-L3 −1.8 Normal
L3-L4 −0.2 Normal
L4-L5 5.7 Normal
L5-S1 2.8 Abnormal

Subject No.	Level	Rotation (degrees)	MR Appearance of Intervertebral Disk
1	L1-L2	−1.0	Normal
	L2-L3	2.1	Normal
	L3-L4	1.8	Normal
	L4-L5	0.8	Normal
	L5-S1	0.8	Normal
2	L1-L2	−0.5	Normal
	L2-L3	0.3	Normal
	L3-L4	1.7	Normal
	L4-L5	−0.4	Normal
	L5-S1	1.9	Normal
3	L1-L2	0.5	Normal
	L2-L3	0.8	Normal
	L3-L4	−0.1	Normal
	L4-L5	1.3	Normal
	L5-S1	2.6	Normal
4	L1-L2	0.1	Normal
	L2-L3	0.9	Normal
	L3-L4	1.0	Normal
	L4-L5	1.3	Normal
	L5-S1	1.2	Normal
5	L1-L2	3.0	Normal
	L2-L3	−1.8	Normal
	L3-L4	−0.2	Normal
	L4-L5	5.7	Normal
	L5-S1	2.8	Abnormal