Biomechanical characteristics of lumbosacral vertebra with
unidirectional axial fusion fixation system

doi:10.3969/j.issn.2095-4344.2653

Abstract

Abstract:

BACKGROUND: It is very important to apply a new technique of minimally invasive, firm fixation and antirotation in the treatment of lumbosacral degenerative diseases.

OBJECTIVE: To provide theoretical basis for clinical application by biomechanical study on the treatment of lumbosacral vertebra instability with unidirectional axial fusion internal fixation system.

METHODS: Six fresh adult lumbosacral specimens were selected, and the lumbosacral motion segments (L₃-S₅) were intercepted and divided into the following five groups: The intact normal control group (N group), bilateral isthmus fissure group (UN group), bilateral isthmus fissure + spur axial fusion internal fixation group (A group), bilateral isthmus fissure + axial screw fixation group (B group), bilateral spondylolysis + axial screw fixation alone + pedicle screw fixation on both sides group (C group). The three-dimensional motion range of flexion, lateral bending and rotation of segment L₅/S₁ in each group of internal fixation was compared with the axial compression resistance.

RESULTS AND CONCLUSION: (1) The stability of fixed mode in A, B and C groups was better than that in the N group and the UN group under different directions of motion, and there were statistically significant differences between the groups (P < 0.05). (2) There was no significant difference in the anterior flexion, posterior flexion and lateral flexion between A, B and C groups (P > 0.05). (3) In the left and right direction of rotation, the three-dimensional motion range of rotation in the A group was significantly reduced compared with that in the B group, and there was no significant difference between A group and C group (P > 0.05). (4) The lumbosacral vertebra unidirectional axial fusion internal fixation system has good biomechanical stability and strong anti-rotation ability, and is expected to be used in clinic.

Key words: unidirectional spur, axial fusion, lumbosacral vertebra diseases, internal fixation, biomechanics

CLC Number:

Yi Guoliang, Song Xizheng, Shu Xiaolin. Biomechanical characteristics of lumbosacral vertebra with unidirectional axial fusion fixation system[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(18): 2789-2793.

Figures/Tables 2

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