Table 3. Subgroup analysis with exclusion of first 20 operated cases (learning phrase) on the sagittal alignment and subsidence.
Variables | Types of expandable cages | ||
---|---|---|---|
Group H (n=20) | Group HL (n=89) | P value | |
Lumbar lordosis (°) | |||
Baseline | 45.0±11.9 | 45.1±13.1 | 0.95 |
Postoperative | 45.6±10.7 | 47.5±13.2 | 0.54 |
Changes (increase) | 0.6±6.4 | 2.8±4.6 | 0.075 |
Segmental lordosis (°) | |||
Baseline | 17.3±7.6 | 16.2±6.6 | 0.59 |
Postoperative | 19.7±5.9 | 21.3±6.6 | 0.31 |
Changes (increase) | 2.4±3.0 | 5.2±3.2 | 0.003* |
Disc angle (°) | |||
Baseline | 5.0±5.1 | 5.6±4.4 | 0.6 |
Postoperative | 8.0±4.2 | 12.2±4.3 | <0.001* |
Changes (increase) | 3.1±5.9 | 6.7±3.7 | <0.001* |
Subsidence | 4 (20.0) | 16 (18.0) | 0.74 |
Data are expressed as mean ± standard deviation or frequency (percentages). *, P<0.05. Group H, expandable cages with only height expansion; Group HL, expandable cages with lordosis and height expansion.