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Table 2 Nonlinear spring input rigidity

From: Compression-distraction reduction surgical verification and optimization to treat the basilar invagination and atlantoaxial dislocation: a finite element analysis

Ligament name

Numbers

A

B

C

D

E

Preoperative

Postoperative

Apical ligament AP

1

1

0.40

0.80

1.20

1.60

7.20

1.14

4.58

10.30

18.30

178.46

Alar ligament AL

8

8

0.07

1.41

2.12

2.82

12.69

0.45

1.79

4.02

7.14

69.62

Anterior longitudinal ligament AAL

3

3

0.20

0.40

0.60

0.79

3.57

0.10

0.41

0.91

1.62

15.82

Joint capsule JC C1–C2

16

16

0.50

0.99

1.49

1.98

8.91

0.10

0.40

0.91

1.61

15.73

Atlantoaxial ligament AAAL

2

2

0.20

0.40

0.60

0.79

3.57

0.10

0.41

0.91

1.62

15.82

Accessory ligament

2

2

0.20

0.40

0.60

0.79

3.57

0.10

0.41

0.91

1.62

15.82

Tectorial membrane TM

5

5

0.60

0.08

0.60

0.08

0.60

1.19

0.34

1.19

0.34

1.19

Anterior atlantooccipital membrane AAOM

4

4

0.95

1.89

2.84

3.78

17.01

0.23

0.91

2.05

3.65

35.59

Ligamenta flava LF

6

4

0.48

0.96

1.44

1.92

8.64

0.08

0.32

0.72

1.27

12.41