Table 1.
Summary of patient and clinical variables for TDR removal and fusion only group
| TDR removal (n = 21) | Fusion only (n = 18) | P value | |
|---|---|---|---|
| Sex (male:female) | 15:6 | 10:8 | 0.31 |
| Mean age insertion TDR | 43.4 (range 32–56) | 40.7 (range 30–63) | 0.11 |
| Mean time in situ TDR | 9.1 (range 3.1–16.0) | 7.2 (range 1.7–14.8) | 0.20 |
| Operated levels | |||
| 1 level | 0.90 | ||
| L2–L3 | 0 | 1 | |
| L3–L4 | 2 | 0 | |
| L4–L5 | 10 | 4 | |
| L5–S1 | 4 | 9 | |
| 2 level | |||
| L4–L5, L5–S1 | 4 | 4 | |
| 3 level | |||
| L2–L3, L4–L5,L5–S1 | 1 | 0 | |
| Complications | |||
| Subsidence | 8 | 9 | |
| Migration | 2 | 6 | |
| Facet joint degeneration | 10 | 14 | |
| Breakage metal wire | 2 | 4 | |
| Osteolysis | 0 | 1 | |
| Adjacent disc degeneration | 5 | 8 | |