Table 4: Mean differences from baseline of patient-reported outcomes and radiographic parameters.
Parameter |
Device |
6 Weeks |
3 Months |
6 Months |
12 Months |
VAS Back Pain |
Expandable |
4.2 (1.0) |
4.9 (1.2) |
5.8 (1.2)* |
6.5 (1.2)* |
Static |
4.7 (2.3) |
5.1 (2.3) |
4.3 (2.9) |
5.1 (2.6) |
ODI |
Expandable |
29.9 (13.1) |
42.6 (12.2)* |
52.4 (13.5)* |
61.1 (11.9)* |
Static |
24.3 (24.4) |
28.8 (20.6) |
26.8 (22.6) |
29.8 (23.4) |
Middle Disc Height (mm) |
Expandable |
5.9 (2.4)* |
5.3 (2.3)* |
5.0 (2.3) |
4.7 (2.4) |
Static |
4.6 (2.8) |
4.1 (3.1) |
4.2 (3.0) |
3.9 (3.2) |
Neuroforaminal Height (mm) |
Expandable |
5.9 (3.9)* |
5.4 (4.0)* |
4.4 (4.0)* |
3.7 (3.9) |
Static |
2.5 (3.5) |
2.3 (3.9) |
1.8 (3.3) |
2.2 (4.3) |
Segmental Lordosis (°) |
Expandable |
4.8 (3.3)* |
4.4 (3.1)* |
4.1 (3.1)* |
3.8 (2.9)* |
Static |
0.6 (5.1) |
0.3 (5.1) |
0.2 (5.6) |
-0.3 (4.6) |
*P<0.05 compared to static. Mean (SD).