Biomechanical advantage of Waveflex semi-rigid internal fixation for lumbar disc herniation

doi:10.3969/j.issn.2095-4344.1959

Abstract

Abstract:

BACKGROUND: Lumbar dynamic fixation is mostly studied in early clinical studies, but there are few studies on the efficacy and mechanical mechanism of mid-stage fixation.

OBJECTIVE: To evaluate the clinical efficacy of Waveflex internal fixation system and analyze its biomechanical advantages, so as to lay a foundation for clinical application and theory research of dynamic fixation.

METHODS: Retrospective analysis was performed in patients who underwent nucleus pulposus excision and semi-rigid internal fixation in the Department of Orthopedics, Affiliated Hospital of Shandong University of Traditional Chinese Medicine from September 2015 to October 2018. All patients signed informed consent. This study was approved by the Ethics Committee of Affiliated Hospital of Shandong University of Traditional Chinese Medicine, China. The corresponding subjective function and objective imaging indexes of the patients in this group before, after and at the last follow-up were statistically analyzed to evaluate the clinical efficacy of implantation of semi-rigid internal fixation. The complete and implanted semi-rigid internal fixation model of the lumbar spine was constructed and finite element analysis was performed to evaluate the biomechanical properties of the Waveflex semi-rigid internal fixation model. The safety and effectiveness were verified by clinical statistical observation.

RESULTS AND CONCLUSION: (1) Waveflex semi-rigid fixation can effectively improve the symptoms of patients, maintain lumbar stability and mobility, and the clinical effect is positive. (2) The system can construct the ladder stress distribution, effectively reduce the stress of the surgical segment, and delay lumbar degeneration. (3) In general, the Waveflex semi-rigid internal fixation can maintain the stability of the fixed segment and has a certain range of motion, which can effectively slow down the degeneration of the fixed segment.

Key words: lumbar disc herniation, Waveflex, semi-rigid internal fixation, lumbar stability, mobility, finite element analysis, stress

CLC Number:

R459.9|R445|R318.01

Gan Donghao, Qiao Quanlai, Chen Deqiang, Tan Guoqing, Xue Haipeng, Xu Zhanwang. Biomechanical advantage of Waveflex semi-rigid internal fixation for lumbar disc herniation[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(36): 5830-5835.

Figures/Tables 7

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