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Table 2 Cervical sagittal parameters on X-ray in the two groups (\( \overline{x} \) ± SD)

From: Posterior open-door laminoplasty secured with titanium miniplates vs anchors: a comparative study of clinical efficacy and cervical sagittal balance

ItemGroup A (n = 42)Group B (n = 37)t valueP value
C2-7 SVA (mm)
 Before surgery20.3 ± 6.920.1 ± 5.40.8560.394
 At 1 month after surgery34.8 ± 5.733.9 ± 5.11.7670.085
 At 2 years after surgery22.4 ± 4.124.9 ± 4.73.1130.002
F value *6.978161.014  
P value*0.0060.000  
C2-7 Cobb angle (°)
 Before surgery21.4 ± 6.621.1 ± 5.80.8340.406
 At 1 month after surgery14.8 ± 3.814.2 ± 3.30.7990.426
 At 2 years after surgery19.5 ± 6.318.5 ± 5.11.6930.093
F value *124.22849.836  
P value*0.0000.001  
T1 Slope (°)
 Before surgery24.7 ± 2.424.4 ± 3.81.0250.307
 At 1 month after surgery33.2 ± 3.532.9 ± 3.21.1660.246
 At 2 years after surgery26.5 ± 2.728.1 ± 3.11.8140.072
F value *26.13333.135  
P value*0.0010.000  
  1. Note: *indicates statistics of intragroup comparison by using repeated measures ANOVA