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. 2024 Mar 15;10(1):55–67. doi: 10.21037/jss-23-106

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.