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송권욱,차승환,정일섭 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.2
Simplified modeling technique was applied to generate finite element models for lumbar spine and instrumented pedicle screw systems. Three consecutive vertebrae were included in a model, and two level instrumentaion was analyzed. In these simplified models, spring elements and multi-point constraints were used to represent the stiffness of functional spine units. Instrumented screws were modeled by using beam elements constrained to adjacent cancellous bone nodes. External loads on lumbar were estimated from intact models, based on the experimentally noted normal range of motion for flexion, extension, lateral bending and torsion. Compression load was determined by overload assumption based on the weight of human body. These estimated loads were regarded as external loads and applied to instrumented models, and section loads in implanted pedicle screw system were computed. The conditions, magnitudes and locations of critical section loads were sought for and summarized. From the computed internal loads, critical load cases were identified. The effective stresses for the critical cases were evaluated and found to be well below the static strength of titanium alloy.