Table 3. Mean differences from baseline of radiographic parameters.
| Parameter | Device | 6 weeks | 3 months | 6 months | Final follow-up |
|---|---|---|---|---|---|
| ADH (mm) | Expandable | 4.6±3.2* | 4.4±3.6* | 4.9±3.5* | 4.6±3.4* |
| Static | 2.0±2.5 | 1.6±2.3 | 1.5±2.6 | 0.8±2.3 | |
| PDH (mm) | Expandable | 3.0±2.1 | 2.3±2.4 | 2.5±1.9* | 2.5±2.1* |
| Static | 2.1±2.0 | 1.8±2.0 | 1.3±1.8 | 0.8±1.9 | |
| NFH (mm) | Expandable | 2.4±3.8 | 2.5±4.5 | 1.8±3.5 | 3.3±7.7* |
| Static | 0.5±2.6 | 0.2±2.6 | 0.2±2.9 | −0.7±3.0 | |
| IVA (°) | Expandable | 1.7±5.0 | 2.6±4.6* | 3.3±4.7* | 3.3±4.9* |
| Static | 0.3±3.2 | 0.1±2.8 | 0.5±3.4 | 0.2±2.7 | |
| Segmental lordosis (°) | Expandable | 1.7±7.0 | 3.3±5.6* | 1.4±6.0 | 1.5±5.7 |
| Static | 0.0±3.0 | −0.5±3.5 | −0.3±4.3 | −1.2±4.0 | |
| Lumbar lordosis (°) | Expandable | 1.8±6.3 | 5.2±6.1* | 4.4±5.3* | 2.7±6.7 |
| Static | 0.5±7.1 | 0.8±5.6 | 0.4±5.9 | 1.0±5.9 |
*, P<0.05 compared to static. Mean ± SD. ADH, anterior disc height; PDH, posterior disc height; NFH, neuroforaminal height; IVA, Intervertebral Angle; SD, standard deviation.