Table 2.
ROM in flexion–extension for groups A and B (with/without follower preload)
| Group A | Preload | Intact | TDR C5–C6 | TDR C4–C5 and C5–C6 | Arthrd. C4–C5 and C5–C6 |
|---|---|---|---|---|---|
| C3–C4 | – | 12.5 ± 4.5 |
12.5 ± 4.5 NS |
12.5 ± 4.5 NS |
13 ± 4 NS |
| Follower | 13 ± 4.5 |
12.5 ± 4.5 NS |
12.5 ± 4 NS |
13 ± 4 NS |
|
| C4–C5 | – | 14.5 ± 4.5 |
15 ± 4 NS |
10.5 ± 3.5 NS |
2 ± 1 p = 0.028 |
| Follower | 15 ± 4.5 |
15.5 ± 4 p = 0.028 |
10.5 ± 3.5 NS |
2.5 ± 1.5 p = 0.028 |
|
| C5–C6 | – | 12.5 ± 3 |
11.5 ± 3.5 NS |
11.5 ± 4 NS |
3.5 ± 2.5 p = 0.028 |
| Follower | 12.5 ± 3 |
12 ± 3.5 NS |
11 ± 4 NS |
3.5 ± 3 p = 0.028 |
|
| C6–C7 | – | 12.5 ± 3 |
13 ± 3.5 NS |
13.5 ± 3.5 NS |
13.5 ± 3.5 NS |
| Follower | 13 ± 3 |
13.5 ± 3 p = 0.046 |
13.5 ± 3.5 p = 0.046 |
14 ± 3.5 NS |
| Group B | Preload | Intact | Arthrd. C5–C6 | TDR C4–C5 and Arthrd. C5–C6 | |
|---|---|---|---|---|---|
| C3–C4 | – | 13 ± 2.5 |
14 ± 3 p = 0.028 |
14.5 ± 3 p = 0.028 |
|
| Follower | 13 ± 2.5 |
14 ± 3 NS |
14.5 ± 3 p = 0.046 |
||
| C4–C5 | – | 14.5 ± 3 |
15.5 ± 3 p = 0.028 |
11.5 ± 2 NS |
|
| Follower | 14.5 ± 2.5 |
15.5 ± 2.5 NS |
10.5 ± 2 p = 0.046 |
||
| C5–C6 | – | 15.5 ± 5 |
3.5 ± 2 p = 0.028 |
3.5 ± 2 p = 0.028 |
|
| Follower | 16.5 ± 4.5 |
3.5 ± 2 p = 0.028 |
4 ± 2 p = 0.028 |
||
| C6–C7 | – | 14.5 ± 3 |
16 ± 3 p = 0.028 |
16 ± 3.5 p = 0.028 |
|
| Follower | 15 ± 3 |
16 ± 3 p = 0.028 |
16.5 ± 3 p = 0.028 |
Mean are expressed in degrees, ± standard deviation
NS Not Significant; statistical significance for instrumented versus intact spines