Biomechanical Comparison of Multilevel Lumbar Instrumented Fusions in Adult Spinal Deformity According to the Upper and Lower Fusion Levels: A Finite Element Analysis

Table 2

Material properties of the pelvic ligaments.

Materials	Stiffness coefficient (/mm)
Anterior sacroiliac ligament	700
Posterior sacroiliac ligament (long)	1000
Posterior sacroiliac ligament (short)	400
Interosseous sacroiliac ligament	2800
Sacrospinous ligament	1400
Sacrotuberous ligament	1500
Superior pubic ligament	500
Arcuate pubic ligament	500
Inguinal ligament	250
Iliolumbar ligament	1000