- 期刊
Biomechanical Evaluation of a Spinal Instrumentation by Using a New Test Apparatus-Experimental and Finite-Element Investigations
並列摘要
For the in vitro mechanical test on the spinal implant assemblies in a cor-pectomy model, the UHMWPE blocks were proposed to substitute for the vete-bral bodies in a new test apparatus. A new anterior spinal instrumentation was experimentally qualified by using this new test apparatus, and a three-dimen-sional finite element model of the spinal implant assembly was constructed to investigate its mechanical behavior under the compressin, bending and torsion loadings. Comparisons of the measurements were made between experimental and finite element analyses to evaluate the applicability of the analytic model. The results showed that an identical displacement was measured by both meth-ods in compressin loading. There was 46% error in the bending test, resulted from the moderate difference of the loading conditions. It showed that the finite element model was applicable. The results of finite element analysis revealed that the concentration site of the plate was located at the attaching edge with the end-block in compression. These stress-related information provided a further prediction about the fatigue fracture of implant and the stress-shielding. To pre-vent the implant failure, the connecting plate is suggested to be thickened in the new anterior spinal instrumentation. For the convenience of the future nvesti-gation, the substitution of finite element model for the experimental analysis may be considered in some cases of evaluation.
延伸閱讀
- Chang, T. S., Cheng, C. W., Wang, C. S., Chen, H. Y., & Chang, J. H. (2009). A New Multi-direction Tester for Evaluation of the Spinal Biomechanics. Journal of Medical and Biological Engineering, 29(1), 7-13. https://www.airitilibrary.com/Article/Detail?DocID=16090985-200902-29-1-7-13-a
- Ke, J. H., Huang, T. J., Chen, P. Q., RN, N., & GBJ, A. (1994). Biomechanical Assessment of the Role of the Posterior Elements of the Lumbar Spine-a Finite Element Analysis. Journal of Orthopaedic Surgery Taiwan, 11(5), 233-248. https://www.airitilibrary.com/Article/Detail?DocID=10116923-199410-11-5-233-248-a
- Liu, C. L., Kao, H. C., Cheng, C. K., Wu, C. M., Jao, W. T., Wong, T. H., & Shih羅惠熙, C. M. (1996). Biomechanical Evaluation of a New Anterior Spinal Instrumentation with End-Plate Fixation. Journal of Orthopaedic Surgery Taiwan, 13(1), 11-15. https://www.airitilibrary.com/Article/Detail?DocID=10116923-199603-13-1-11-15-a