Table 4 Changes of foramen area and height
From: The effects of cages implantation on surgical and adjacent segmental intervertebral foramina
| Group A | Group B | Group C | P value | |
|---|---|---|---|---|
| Area (mm2) | ||||
| Upper segment | ||||
| Preoperation | 53.403±11.541 | 49.953±11.332 | 45.672±9.784 | 0.060 |
| Postoperation | 55.927±14.731C | 49.251±9.814C | 41.525±7.744* | 0.010 |
| Follow-up | 53.349±13.903C | 49.011±9.679C | 39.938±7.962* | <0.001 |
| Surgical segment | ||||
| Preoperation | 35.643±15.483 | 34.851±8.590 | 34.832±10.251 | 0.945 |
| Postoperation | 39.847±11.617* | 42.105±8.527* | 46.314±9.700* | 0.061 |
| Follow-up | 39.755±10.802* | 41.450±8.690* | 45.631±9.164* | 0.081 |
| Lower segment | ||||
| Preoperation | 43.509±9.122 | 46.213±9.564 | 41.384±10.808 | 0.097 |
| Postoperation | 42.266±9.062 | 45.651±8.132C | 37.288±9.449* | <0.001 |
| Follow-up | 42.281±8.654 | 45.074±7.912C | 36.477±8.830* | <0.001 |
| Height (mm) | ||||
| Upper segment | ||||
| Preoperation | 8.683±1.032 | 8.674±1.355 | 8.014±0.832 | 0.072 |
| Postoperation | 8.748±0.969C | 8.617±1.315C | 7.379±0.856* | <0.001 |
| Follow-up | 8.633±0.882C | 8.555±1.271C | 7.243±0.812* | <0.001 |
| Surgical segment | ||||
| Preoperation | 7.252±1.524 | 7.382±1.029 | 7.106±0.925 | 0.586 |
| Postoperation | 8.110±1.254* | 8.452±0.973* | 8.725±0.995* | 0.124 |
| Follow-up | 8.033±1.165* | 8.374±0.954* | 8.665±0.998* | 0.098 |
| Lower segment | ||||
| Preoperation | 7.669±1.463 | 8.148±1.194 | 7.565±1.279 | 0.083 |
| Postoperation | 7.921±1.178 | 8.218±1.169C | 7.154±1.271* | 0.002 |
| Follow-up | 7.824±1.085C | 8.067±0.940C | 6.960±0.957* | <0.001 |