Table 1.
Numbers of fused levels
| Fused levels | Group 1 | Group 2 |
|---|---|---|
| L5–S1 | 9 | 9 |
| L4–S1 | 11 | 1 |
| L3–S1 | 4 | 1 |
| L1–L5 | 1 | 0 |
| L3/4 | 1 | 0 |
| L4/5 | 1 | 2 |
In group 1 fusion length averaged 1.8 segments (range 1–4; SD 0.8) and in group 2 it was 1.2 segments (range 1–3; SD 0.6)
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