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Biomechanical Effect of Total Disc Replacement on Lumbar Spinal Segment : A Finite Element Analysis  

Park, Won-Man (경희대학교 대학원, 기계공학과)
Kim, Ki-Tack (경희대학교 의과대학 정형외과학교실)
Hong, Gyu-Pyo (경희대학교 의과대학 정형외과학교실)
Kim, Yoon-Hyuk (경희대학교 테크노공학대학)
Oh, Taek-Yul (경희대학교 테크노공학대학)
Publication Information
Korean Journal of Computational Design and Engineering / v.13, no.1, 2008 , pp. 58-66 More about this Journal
Abstract
The artificial discs have recently used to preserve the motion of the treated segment in lumbar spine surgery. However, there have been lack of biomechanical information of the artificial discs to explain current clinical controversies such as long-term results of implant wear and excessive facet contact forces. In this study, we investigated the biomechanical effects of three artificial implants on the lumbar spinal segments by finite element analysis. The finite element model of intact lumbar spine(L1-S) was developed and the three implants were inserted in L4-L5 segment of the spine model. 5 Nm of flexion and extension moments were applied on the superior plate of L1 with 400 N of compressive load. Excessive motions and high facet contact forces at the surgical level were generated in the all three implanted models. In the flexion, the peak von-Mises stresses in the semi-constrained type implant was higher than those in the un-constrained type implant which would cause wear on the polyethylene core. The results of the study would provide a biomechanical guideline for selecting optimal surgical approach or evaluating the current design of the implants, or developing a new implant.
Keywords
Biomechanics; lumbar spine; total disc replacement; artificial disc; finite element analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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