Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Development of a Functional Fixator System for Bone Deformity Near Joints

  • Published : 2006.02.01
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Abstract

A functional external fixator system for bone deformity near the joints using worm gear was developed for curing the angle difference in fracture bones while the lengthening bar was developed for curing the differences in length, also in fracture bones. Both experiments and FE analysis were performed to compare the elastic stiffness in several loading modes and to improve the functional external fixator system for bone deformity near joints. The FE model using compressive and bending FE analysis was applied due to the angle differentiations. The results indicate that compressive stiffness value in the experiment was 175.43N/mm, bending stiffness value in the experiment was 259.74 N/mm, compressive stiffness value in the FEA was 188.67 N/mm, and bending stiffness value in the FEA was 285.71 N/mm. Errors between experiments and FEA were less than $10\%$ in both the 'compressive stiffness and the bending stiffness. The maximum stress (157 MPa) applied to the angle of the clamp was lower than the yield stress (176.4 MPa) of SUS316L. The degree of stiffness in both axial compression and bending of the new fixator are about 2 times greater than other products, with the exception of EBI (2003).

Keywords

References

  1. Behrens, F., 1989, 'General Theory and Principles of External Fixation,' Clin Orthop, Vol. 241, pp. 15-23
  2. Kempson, G. E. and Campbell, D., 1981, 'The Comparative Stiffness of External Fixation Frames,' Injury, Vol. 12-4, pp. 297-304 https://doi.org/10.1016/0020-1383(81)90205-9
  3. Kim, H. T., Lee S. H., 2000, 'Clinical Application of Domestic External Fixator System (Dyna-Extor),' Korean Orthopaedic Association Journal, Vol. 35, pp. 845-849
  4. Koo, T. K. K., Kim, Y. H., Choi, D. B., Jua, K. G., Lim, J., Inoue, N. and Chao, E. Y. S., 2003, 'Stiffness Analysis of Dynafix External Fixator System,' 2003 Summer Bioengineering Conference, pp. 1227-1228
  5. Kristiansen, T., Fleming, B., Reinecke, S. and Pope, M. H., 1987, 'Comparative Study of Fracture Gap Motion in External Fixation,' Clinical Biomechanics, Vol. 2-4, pp. 191-195 https://doi.org/10.1016/0268-0033(87)90080-5
  6. Lee, M. K., Choi, K. and Choi, I, H., 2002, 'The Effect of Mechanical Dynamization on Regenerative Bone Healing,' Porceedings of the Korean Society of Precision Engineering Conference, pp. 158-161
  7. Oh, J. K. and Park, J. H, 1998, 'Axial Stiffness of the Ilizarov External Fixator System Using Rancho Method,' Korean Orthopaedic Association Journal, Vol. 33, No. 7, pp. 1928-1932
  8. Paley, D., Flemming, B., Catagni, M., Kristiansen, T. and Pope, M., 1990, 'Mechanical Evaluation of External Fixators Used Limb Lengthening,' Clin Orthop, Vol. 250, pp. 50-57
  9. Perren, S. M., 1979, 'Physical and Biological Aspects of Fracture Healing with Special Reference to Internal Fixation,' Clin Orthop, Vol. 138, pp. 175-196
  10. Sisk, T. D., 1983, 'External Fixation, Historic Review, Advantage, Complications, and Indications,' Clin Orthop, Vol. 180, pp. 15-22