15 June 2020>: Medical Technology
Comparative Three-Dimensional Finite Element Analysis of 4 Kinds of Pedicle Screw Schemes for Treatment of Adult Degenerative Scoliosis
Yang Zhou 1ABE , Daqi Xin 2CD , Zhuoting Lei 3C , Yuan Zuo 4CD* , Yan Zhao 4EG*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. |