Ranges of motion of L5-S1 and of the SIJ for the various configurations.
| Flexion-Extension | Lateral Bending | Axial Rotation | ||||
| Configuration | L5-S1 | SIJ | L5-S1 | SIJ | L5-S1 | SIJ |
| S2AI | 0.9 | 0.6 | 0.9 | 0.4 | 0.8 | 0.3 |
| PFFI | 0.9 | 0.6 | 0.8 | 0.4 | 0.7 | 0.3 |
| PFFI-IFSAI | 0.9 | 0.2 | 0.9 | 0.2 | 0.7 | 0.1 |
| 2-PPFI | 0.6 | 0.2 | 0.4 | 0.2 | 0.6 | 0.1 |
Abbreviations: PFFI, porous fusion/fixation implant; PFFI-IFSAI, PFFI inserted bilaterally in an S2AI trajectory; 2-PFFI, S2AI position PFFI; S2AI, S2 alar-iliac; SIJ, sacroiliac joint.
Note: All values are in degrees (°).