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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 2 The maximum force values and positions of the screw-rod systems under 7 different work conditions of 4 screw models.

Work conditionMaximum stress values (Mpa) of different screw models
Full-segment screw system (position)Interval screw system (position)Key vertebra screw system (position)Strategic screw system (position)
Upright74.514 (L1, left)75.782 (L2, left)70.91 (L5, right)71.728 (T12, left)
Forward flexion463.04 (L5, right)474.14 (L4, left)492.58 (L5, right)537.74 (L5, right)
Backward extension455.44 (L5, right)476.23 (L5, right)501.74 (L5, right)550.16 (L5, right)
Left lateral flexion385.92 (L5, right)486.37 (T12, left)424.83 (T12, left)495.85 (T12, left)
Right lateral flexion381.38 (L5, right)563.88 (T12, left)493.98 (T12, left)582.31 (T12, left)
Left axial rotation208.37 (T12, left)333.39 (T12, left)298.67 (T12, left)369.95 (T12, left)
Right axial rotation208.54 (T12, left)333.43 (T12, left)298.74 (T12, left)369.99 (T12, left)
L – lumbar vertebra; T – thoracic vertebra.

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750