Table 3 Imaging outcomes.
Characteristics | UPS | BPS | X2/t/W M-W | p |
|---|---|---|---|---|
Preoperative SL° | 4.33 ± 1.25 | 4.86 ± 2.41 | 1.052 | 0.298 |
Postoperative SL° | 7.18 ± 1.05* | 7.06 ± 1.01* | 0.350 | 0.728 |
Fusion rate at 6Â months(n, %) | Â | Â | 7.8 | 0.034 |
 Grade I | 3(11.1%) | 7(23.3%) |  |  |
 Grade I | 7(25.9%) | 15(50.0%) |  |  |
 Grade III | 16(59.3%) | 8(26.7%) |  |  |
 Grade IV | 1(3.7%) | 0 |  |  |
Fusion at 12Â months(n, %) | Â | Â | 3.663 | 0.275 |
 Grade I | 18(66.7%) | 26(86.7%) |  |  |
 Grade II | 5(18.5%) | 3(10.0%) |  |  |
 Grade III | 3(11.1%) | 1(3.3%) |  |  |
 Grade IV | 1(3.7%) | 0 |  |  |
Cage subsidence at 1Â year postoperatively | Â | Â | 2.162â–² | 0.031 |
 Grade 0 | 21 | 29 |  |  |
 Grade I | 5 | 1 |  |  |
 Grade II | 1 | 0 |  |  |
 Grade III | 0 | 0 |  |  |