Table 1.

Absolute average range of motion (ROM) in degrees for an intact specimen, injured specimen, and three different Dynesys spacer lengths (short, standard, and long) in flexion, extension, lateral bending, and axial rotation. (A) Without a compressive follower preload. (B) With a compressive follower preload

Condition	Flexion	Extension	Lateral bending	Axial rotation
A: Without follower load
Intact	3.7±1.5	3.3±1.5	3.8±1.4	2.1±0.9
Injury	6.1±1.4	4.4±1.2	5.0±1.8	2.8±1.2
Short	0.5±0.4	0.5±0.3	0.8±0.5	1.3±0.9
Standard	1.0±0.6	1.1±0.7	1.0±0.5	1.6±1.0
Long	1.0±0.5	1.3±0.9	1.2±0.5	1.9±0.9
B: With follower load
Intact	4.4±2.0	2.4±0.9	2.4±1.2	1.2±0.5
Injury	5.8±2.5	2.7±1.7	1.4±0.9	1.3±0.6
Short	0.4±0.3	0.3±0.2	0.5±0.3	0.9±0.4
Standard	0.5±0.3	0.5±0.3	0.5±0.2	1.0±0.5
Long	0.5±0.3	0.6±0.2	0.6±0.3	1.2±0.5

Numbers are the average and standard deviation for ten specimens. Lateral bending and axial rotation ROM are reported as an average of one side only