15 June 2020 : Clinical Research
Comparative Three-Dimensional Finite Element Analysis of 4 Kinds of Pedicle Screw Schemes for Treatment of Adult Degenerative Scoliosis
Yang Zhou1ABE, Daqi Xin2CD, Zhuoting Lei3C, Yuan Zuo4CD, Yan Zhao4EG*DOI: 10.12659/MSM.922050
Med Sci Monit 2020; 26:e922050
Table 3 The maximum force values at L1, 2, 5 or T12 of the vertebral bodies under 7 different work conditions of 4 screw models.
| Work condition | Maximum stress values (Mpa) of different screw models | |||
|---|---|---|---|---|
| Full-segment screw system (position) | Interval screw (position) | Key vertebra screw system (position) | Strategic screw system (position) | |
| Upright | 23.322 (L2) | 26.484 (L2) | 22.131 (L2) | 13.46 (L1) |
| Forward flexion | 259.77 (L2) | 276.34 (L2) | 245.27 (L2) | 165.08 (L5) |
| Backward extension | 257.14 (L2) | 280.43 (L2) | 248.42 (L2) | 163.94 (L5) |
| Left lateral flexion | 123.04 (L2) | 154.79 (L2) | 120.39 (L2) | 110.59 (L5) |
| Right lateral flexion | 134.38 (L2) | 177.75 (L2) | 139.26 (L2) | 109.74 (L5) |
| Left axial rotation | 71.064 (L2) | 98.844 (L2) | 82.07 (L2) | 48.425 (T12) |
| Right axial rotation | 71.054 (L2) | 98.836 (L2) | 80.053 (L2) | 48.404 (T12) |
| L – lumbar vertebra; T – thoracic vertebra. | ||||