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Table 4 Comparison of parameters in GAP score between MC and NMC

From: Which sagittal evaluation system can effectively predict mechanical complications in the treatment of elderly patients with adult degenerative scoliosis? Roussouly classification or Global Alignment and Proportion (GAP) Score

Post-variables

MC

(n = 41)

NMC

(n = 39)

P value

GAP score

8.8 ± 2.7

6.8 ± 3.4

0.005

 Post-PI

53.1 ± 13.0

48.7 ± 8.9

0.082

 Post-SS

27.7 ± 6.0

28.6 ± 8.3

0.577

 Ideal SS

40.3 ± 7.7

37.7 ± 5.2

0.082

 Post-RPV

− 12.6 ± 7.7

− 9.1 ± 5.1

0.019

 Post-RPV score

2.0 ± 1.0

1.3 ± 1.1

0.003

 Post-LL

32.3 ± 11.0

35.5 ± 10.2

0.177

 Ideal LL

61.9 ± 8.1

59.2 ± 5.5

0.082

 Post- RLL

− 29.7 ± 10.6

− 23.7 ± 8.0

0.006

 Post-RLL score

2.5 ± 0.7

2.2 ± 0.9

0.054

 Post-LDI

0.9 ± 0.3

0.8 ± 0.2

0.200

 Post-LDI score

1.7 ± 1.5

1.3 ± 1.5

0.256

 Post-GT

27.3 ± 13.5

20.6 ± 6.6

0.007

 Post-Age

76.1 ± 2.3

76.9 ± 2.7

0.124

GAP score categories

  

0.012

 Proportioned

1 (2.4%)

3 (7.7%)

0.281

 Moderately disproportioned

7 (17.1%)

17 (43.6%)

0.010

 Severely disproportioned

33 (80.5%)

19 (48.7%)

0.003

  1. GAP score, global alignment and proportion score; Post, postoperative; MC, mechanical complication group; NMC, no mechanical complication group; SS, sacral slope; LL, lumbar lordosis; RPV, relative pelvic version; RLL, relative lumbar lordosis; LDI, lordosis distribution index; GT, global tilt