Cage motion results for pedicle/screw rod and anterior-lateral plate specimens with endplate fracture during interbody cage placement
| Endplate fracture location and level | Lateral cage translation (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| F/E | LB | AR | |||||||
| A-P | M-L | I-S | A-P | M-L | I-S | A-P | M-L | I-S | |
| Pedicle screw/rod Inferior endplate at L4-L5 | 0.5 | 0.1 | 0.3 | 0.4 | 0.1 | 0.5 | 3.3 | 1.2 | 1.0 |
| *PSR groupavg.(StDev) | |||||||||
| n = 17 levels | |||||||||
| 0.4 | 0.1 | 0.2 | 0.2 | 0.1 | 0.2 | 0.8 | 0.3 | 0.2 | |
| (0.1) | (0.1) | (0.1) | (0.1) | (0.1) | (0.2) | (0.4) | (0.3) | (0.1) | |
| Lateral plate/screw | |||||||||
| AInferior endplate at L3-L4 | 0.1 | 0.1 | 0.1 | 3.2 | 0.5 | 1.8 | 0.5 | 0.2 | 0.2 |
| Inferior endplate at L4-L5 | 0.1 | 0.0 | 0.1 | 0.2 | 0.0 | 0.2 | 0.4 | 0.1 | 0.3 |
| Superior endplate at L4-L5 | 0.3 | 0.1 | 0.7 | 0.4 | 0.8 | 2.1 | 2.1 | 1.5 | 0.5 |
| BInferior endplate at L3-L4 | 0.5 | 0.1 | 0.0 | 0.2 | 0.1 | 0.0 | 0.7 | 0.2 | 0.2 |
| *ALP groupavg.(StDev) | |||||||||
| n = 14 levels | |||||||||
| 0.3 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.8 | 0.2 | 0.4 | |
| (0.2) | (0.1) | (0.4) | (0.1) | (0.4) | (0.2) | (1.0) | (0.3) | (0.4) | |
Abbreviations: avg., average; StDev, standard deviation. Lateral cage translations were measured during cyclic loading along theanterior-posterior (A-P), medial-lateral (M-L), and inferior-superior (I-S) axes for each loading mode.
↵* Average cage translations for the respective treatments (PSR and ALP) inspecimens with intact endplates.