Table 1 Demographic data of the study population stratified by lumbar interbody fusion types
| Â | ALIF | OLIF | TLIF | Overall | P value |
|---|---|---|---|---|---|
Patient number | 3 | 20 | 41 | 64 | Â |
Correction levels | 3 | 44 | 57 | 104 | Â |
Age | 67 ± 1.7 | 66.5 ± 4.2 | 64.7 ± 5.5 | 64 ± 5.3 | 0.57 |
Female gender (%) | 100% | 85% | 85.4% | 85.9% | 0.6 |
Pre−OP diagnosis | |||||
 Spondylolisthesis | 1 | 15 | 34 | 50 |  |
 Spondylosis | 2 | 5 | 6 | 13 |  |
 Other | 0 | 0 | 1 | 1 |  |
Index fusion level | Â | Â | Â | Â | 0.09 |
 L1-L2 | 0 | 1 | 0 | 1 | |
 L2-L3 | 0 | 5 | 3 | 8 | |
 L3-L4 | 1 | 18 | 13 | 32 | |
 L4-L5 | 1 | 20 | 30 | 51 | |
 L5-S1 | 1 | 0 | 11 | 12 | |
Fusion status | Â | Â | Â | Â | 0.8 |
 Grade I | 0 | 5 | 5 | 10 | |
 Grade II | 0 | 10 | 7 | 17 | |
 Grade III | 3 | 29 | 45 | 77 | |
Fusion rate (%) (Grade II and III) | 100 | 88.6 | 91.2 | 90.4 | |
Subsidence (%) | 0 | 40.9 | 21.1 | 28.8 | 0.03 |