Table 2. Mean values of radiographic parameters.
| Parameter | Device | Baseline | 6 weeks | 3 months | 6 months | Final follow-up |
|---|---|---|---|---|---|---|
| ADH (mm) | Expandable | 10.1±3.1 | 14.5±1.7* | 14.5±1.7* | 14.7±1.9* | 14.7±2.0* |
| Static | 7.5±2.9 | 9.0±2.3* | 9.1±2.1* | 9.0±2.3* | 8.4±1.7 | |
| PDH (mm) | Expandable | 5.7±2.0 | 8.7±2.5* | 8.0±2.2* | 8.0±2.3* | 8.2±2.2* |
| Static | 4.4±1.8 | 6.2±1.2* | 6.0±1.1* | 5.9±1.1* | 5.1±1.1 | |
| NFH (mm) | Expandable | 18.8±4.7 | 21.1±4.6* | 21.2±4.8* | 20.9±4.4* | 22.2±7.8* |
| Static | 17.4±3.9 | 17.7±5.0 | 17.5±4.9 | 18.0±3.8 | 16.7±4.0 | |
| IVA (°) | Expandable | 6.9±4.2 | 8.7±5.3 | 9.9±5.2* | 9.8±5.4* | 9.9±5.2* |
| Static | 4.7±3.3 | 5.0±3.4 | 5.0±2.8 | 5.1±3.2 | 5.0±2.6 | |
| Segmental lordosis (°) | Expandable | 19.0±7.0 | 20.5±8.1 | 22.3±7.1* | 20.2±8.2 | 20.6±8.5 |
| Static | 16.9±6.1 | 16.4±6.4 | 16.4±6.1 | 16.5±5.1 | 15.7±5.6 | |
| Lumbar lordosis (°) | Expandable | 53.5±12.1 | 54.2±11.3 | 59.7±10.9* | 57.1±11.7* | 55.8±13.8* |
| Static | 47.5±11.3 | 46.5±10.2 | 48.5±10.1 | 49.0±8.8 | 48.5±9.7 |
*, P<0.05 compared to baseline. Mean ± SD. ADH, anterior disc height; PDH, posterior disc height; NFH, neuroforaminal height; IVA, Intervertebral Angle; SD, standard deviation.