Comparison of Postoperative Outcome and Mechanical Complications between the 2 Groups.
| Variable | ALIF (n = 32) | PLIF (n = 24) | P |
| Overall mechanical complications rate | 2 (6.2%) | 9 (37.5%) | 0.003 |
| Type of mechanical complications | |||
| Screw loosening | 0 (0%) | 4 (16.7%) | 0.0646 |
| Screw breakage | 0 (0%) | 1 (4.2%) | |
| Rod breakage | 1 (3.1%) | 2 (8.3%) | |
| Rod dislocation | 0 (0%) | 1 (4.2%) | |
| Sacrum fracture | 1 (3.1%) | 1 (4.2%) | |
| Implant-related pain | 0 (0%) | 4 (16.7%) | 0.017 |
| Pseudarthrosis rate | 1 (3.1%) | 5 (20.8%) | 0.035 |
| Reoperation | 1 (3.1%) | 5 (20.8%) | 0.035 |
Abbreviations: ALIF, anterior lumbar interbody fusion; PLIF, posterior lumbar interbody fusion.