Table 3 Radiographic Parameters
|  | New approach group(n = 21) | Traditional posterior surgery group(n = 29) | P |
|---|---|---|---|
Canal encroachment(%) | Â | Â | Â |
 Preoperation | 45.6 ± 17.7 | 47.5 ± 19.8 | 0.729 |
 Postoperation | 6.1 ± 5.4 | 13.1 ± 7.5 | 0.001 |
 Last follow-up | 4 ± 3.8 | 9.1 ± 6 | 0.001 |
Kyphosis angle(°) |  |  |  |
 Preoperation | 21.1 ± 3.1 | 22.3 ± 3.3 | 0.2 |
 Postoperation | 6.1 ± 2.2 | 5.1 ± 1.2 | 0.072 |
 Last follow-up | 9.3 ± 2.6 | 10.3 ± 2.4 | 0.171 |
Anterior height(%) | Â | Â | Â |
 Preoperation | 53.2 ± 11.8 | 51.5 ± 12.1 | 0.633 |
 Postoperation | 90.1 ± 7.9 | 88.4 ± 9.2 | 0.51 |
 Last follow-up | 88.2 ± 8.4 | 86.3 ± 10.1 | 0.487 |