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