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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