TABLE 3. Comparison of range of motions and SVA between OPLL progression and non-progression group in pre- and post-operative cervical X-rays.
| Parameters | OPLL | p-value | |
|---|---|---|---|
| Progression | Non-progression | ||
| Pre-operative cervical range of motion (°) | 43.5±11.0 | 45.1±12.8 | 0.72 |
| Pre-operative flexion range of motion (°) | 30.9±11.3 | 29.5±9.2 | 0.69 |
| Pre-operative extension range of motion (°) | 12.7±7.2 | 15.7±8.7 | 0.32 |
| Post-operative cervical range of motion (°) | 30.1±10.2 | 33.1±9.3 | 0.39 |
| Post-operative flexion range of motion (°) | 21.0±5.7 | 22.8±9.0 | 0.55 |
| Post-operative extension range of motion (°) | 9.1±8.3 | 9.8±7.5 | 0.81 |
| Post-operative cervical range of motion changes (°) | −13.4±10.7 | −12.0±13.6 | 0.78 |
| Post-operative flexion range of motion changes (°) | −9.8±9.5 | −6.7±11.0 | 0.42 |
| Post-operative extension range of motion changes (°) | −3.6±3.7 | −5.9±10.0 | 0.24 |
| Post-operative neutral C2-C7 angle changes (°) | −0.1±7.0 | −4.1±10.0 | 0.24 |
| Post-operative SVA changes (mm) | 5.8±7.9 | −3.7±6.3 | 0.00 |
Values are presented as mean±standard deviation.
SVA: sagittal vertical axis, OPLL: ossification of the posterior longitudinal ligament.