Subsidence results.
| Subsidence Grade | Degree of Subsidence | PIC ALIF (n = 20) | PIC TLIF (n = 4) | Stock ALIF (n = 2) |
| Grade 0 | 0%–24% | 20 (100%) | 3 (75%) | 0 |
| Grade I | 25%–49% | 0 | 1 (25%) | 1 (50%) |
| Grade II | 50%–74% | 0 | 0 | 1 (50%) |
| Grade III | >75% | 0 | 0 | 0 |
Abbreviations: ALIF, anterior lumbar interbody fusion; PIC, personalized interbody cage; TLIF, transforaminal lumbar interbody fusion.