Table 2 Radiographic parameters (±SD)
Group | Intervertebral mobility at L2–3 | Intervertebral mobility at L3–4 | General adjacent segment mobility (GASM) | ||
|---|---|---|---|---|---|
Before surgery | 3 years after surgery | Before surgery | 3 years after surgery | 3 years after surgery | |
Topping-off | 4.11 ± 1.52a | 4.30 ± 1.71a | 4.42 ± 1.91b | 3.03 ± 1.33b | 7.19 ± 2.31 |
PLIF | 4.29 ± 1.81b | 7.03 ± 2.14b | – | – | 7.03 ± 2.14* |
t | 1.364 | 31.782 | – | – | 0.721 |
P | > 0.05 | < 0.01 | – | – | > 0.05 |