Table 2.

Absolute average neutral zone (NZ) in degrees for an intact specimen, injured specimen, and three different Dynesys spacer lengths (short, standard, and long) in flexion–extensions, lateral bending, and axial rotation. (A) Without a compressive follower preload. (B) With a compressive preload

Condition	Flex–Ext	Lateral bending	Axial rotation
A: Without follower load
Intact	0.4±0.5	0.7±0.4	0.3±0.3
Injury	1.3±1.0	1.1±0.7	0.5±0.5
Short	0.1±0.0	0.1±0.1	0.2±0.2
Standard	0.2±0.1	0.1±0.1	0.3±0.3
Long	0.2±0.2	0.2±0.1	0.3±0.2
B: With follower load
Intact	0.6±0.5	1.1±0.6	0.1±0.1
Injury	0.8±0.8	0.5±0.3	0.2±0.2
Short	0.1±0.0	0.1±0.1	0.2±0.1
Standard	0.1±0.1	0.1±0.1	0.2±0.2
Long	0.1±0.0	0.2±0.1	0.2±0.2

Numbers are the average and standard deviation for the ten specimens