ENG  Vol.5 No.10 B , October 2013
Fatigue Life Analysis of Fixed Structure of Posterior Thoracolumbar Pedicle Screw
Abstract: In order to analyze the fatigue life of the posterior thoracolumbar fixed structure, a loading model was established in accordance with the anti-fatigue test requirements specified by ASTM Standard F1717-04. Two three-dimensional Models of the fixed structure with two bars and four bars were built by 3D software (UG), and imported into ANSYS software for static analysis. The maximum and minimum stresses of risk nodes under different loads and moments were obtained. The fatigue life was then calculated using relevant mathematical formula of S-N curve and Goodman curve. It was found that the stress at the middle of the crossbeam between the two bars is larger than the surroundings and is liable to suffer from fatigue.
Cite this paper: Yang, T. , Chen, K. and Lv, Y. (2013) Fatigue Life Analysis of Fixed Structure of Posterior Thoracolumbar Pedicle Screw. Engineering, 5, 292-296. doi: 10.4236/eng.2013.510B060.

[1]   ASTM Standard F1717, “Standard Test Methods for Spinal Implant Constructs in a Vertebrectomy Model,” ASTM International, West Conshohocken, 2013.

[2]   P. R. Harrington and H. S. Tullos, “Reduction of Severe Spondylolisthesis in Children,” Southern Medical Journal, Vol. 62, No. 1, 1969, pp. 1-7.

[3]   E. Wagnac, D. Michardière, A. Garo, P. J. Arnoux, J. M. Mac-Thiong and C. E. Aubin, “Biomechanical Analysis of Pedicle Screw Placement: A Feasibility Study,” Studies in Health Technology and Informatics, Vol. 158, 2009, pp. 167-171.

[4]   Y. Wang, A. M. Jin and G. F. Fang, “Three-Demesional Finite Element Analysis of the Lumbar Pedicle Screw Instrumentation,” Journal of Clinical Rehabilitative Tissue Engineering Research, Vol. 12, No. 48, 2008, pp. 9439- 9442.

[5]   F. B. Christensen, B. K. Nielsen, E. S. Hansen, S. Pilgaard and C. E. Bunger, “Anterior Lumbar Intercorporal Spondylodesis. Radiological and Functional Therapeutic Results,” Ugeskrift for Laeger, Vol. 156, No. 37, 1994, pp. 5285-5289.

[6]   K. B. Sagomonyants, M. L. Jarman-Smith, J. N. Devine, M. S. Aronow and G. A. Gronowicz, “The in Vitro Response of Human Osteoblasts to Polyetheretherketone (PEEK) Substrates Compared to Commercially Pure Titanium,” Biomaterials, Vol. 29, No. 11, 2008, pp. 1563-1572.

[7]   L. Mark, Z. Michael, S. Paul, V. Lori, C. M. Ann, B. Raj and C. Richard, “A Comparison of Single-Level Fusions With and Without Hardware,” Spine, Vol. 16, No. 8, 1991, p. 455.

[8]   P. D. Angevine, C. A. Dickman and P. C. McCormick, “Lumbar Fusion with and Without Pedicle Screw Fixation: Comments on a Prospective, Randomized Study,” Spine, Vol. 32, No. 13, 2007, pp. 1466-1471.

[9]   H. S. Lai, Y. J. Li, F. Z. Xuan and S. D. Tu, “High Cycle Fatigue in Ti-6Al-4V Titanium Alloy,” Journal of Nanjing University of Technology, Vol. 31, No. 5, 2009, pp. 15-19.