Biomechanical Analysis of a spacer for knee neoplasms in terms of resection extension by means of finite elements
Keywords:spacer, arthrodesis, finite Element
When knee bony tumors appear, arthrodesis is one terapeutic option after tumor block resection. The implant is composed of an intramedular nail with four interlocking pins. The whole implant is manufactured using a titanium alloy (Ti-6Al-4V). The spacer has the capability of be extended from 20 cm up to 30 cm, and it is used as a definitively treatment. The use of this item reports good result despite the fact that affected limb is arthrodesed. However, it has a great interest to study the influence of bone tumor resection size on the implant integrity. To perform this research work, we developed a finite element model of the complex femur-implant-tibia, by means of Ansys software version 11 (Ansys, Inc). The loading conditions used during modeling process correspond to those occurring during midstance phase of gait. We analyzed six cases, varying spacer length: 20 cm, 22 cm, 24 cm, 26 cm, 28 cm and 30 cm. Our results indicate that there is no fracture failure risk within the implant when varying spacer length over the range previously stated, since we did not find significative difference on stress levels within the implant. However, stress levels of inter locking tibial pins are increased considerably for a resection of 24 cm or higher, this fact could lead us to implant loosening.
G. Rico Martínez, L. Linares González, L. Díaz Rodríguez, M. de la Garza Navarro. “Tratamiento de los tumores óseos mediante resección en bloque y colocación de clavo Colchero especial con espaciador metálico”. Rev. Mex Ortop Traum. Vol. 12. 1996. pp. 445-449.
M. Malawer, L. Chou. “Prosthetic survival and clinical results with use of large-segmental replacements in the treatment of high-grade bone sarcomas”. J. Bone Joint Surg. Vol. 77-A. 1995. pp. 1154-1165.
A. Simon. “Current concept review. Limb salvage for osteosarcoma”. J. Bone Joint Surg. Vol. 70A. 1988. 307-310.
G. Blunn, T. Briggs, S. Cannon, P. Walker, P. Unwin, S. Culligan, J. Cobb. “Cementless fixation for primary segmental bone tumor endoprostheses”. Clin. Orthop. Vol. 372. 2000. pp. 223-230.
J. Arroyo, K. Garvin, J. Neff. “Arthrodesis of the knee with a modular titanium intramedullary nail”. J. Bone Joint Surg. Vol. 79A. 1997. pp. 26-35.
I. Harris, A. Leff, S. Gitelis, M. Simon. “Function after amputation, arthrodesis, or arthroplasty for tumors about the knee”. J. Bone. Joint Surg. Vol. 72A. 1990. pp. 1477-1485.
V. Domínguez, M. Carbajal, C. Feria, G. Urriolagoitia, L. Hernández, G. Rico, Z. Damián Noriega, P. Lomelí Mejía. “Biomecánica de un fémur sometido a carga. Desarrollo de un modelo tridimensional por medio del método del elemento finito”. Rev. Mex Ortop. Traum. Vol. 13. 1999. pp. 633-638.
A. Rohlmann, G. Bergmann, R. Koelbel. “The relevance of stress computation in the femur with and without endoprothesis”. R. H Gallagher, B. R. Simon, P.C. Jhonson, J. F Gross (editors). Finite Elements in Biomechanics. Ed. John Wiley & Sons. 1982. New York. pp. 361-377.
S. Kalidindi, P. Ahmad. “A numerical investigation of the mechanics of swelling-type intramedullary hip implants”. Journal of Biomechanical Enginnering. Vol. 119. 1997. pp. 241-247.
C. Wang, A. Yettram, M. Yao, P. Procter. “Finite element analysis of a Gamma nail within a fractured femur”. Medical Engineering & Physics. Vol. 20. 1998. pp. 677-683.
M. Taylor, K. Tanner, M. Freeman, A. Yettram. “Cancellous bone stresses surrounding the femoral component of a hip prothesis: an elastic-plastic finite element analysis”. Medical Engineering & Physics. Vol. 17. 1995. pp. 544-550.
Y. Kang, H. Park, Y. Youm, I. Lee, M. Ahn, J. Ihn. “Three dimensional shape reconstruction and finite element analysis of femur before and after the cementless type of total hip replacements”. Journal of Biomedical Engineering. Vol. 15. 1993. pp. 467-504.
K. Polgar, M. Viceconti, J. O`Connor. “A comparison between automatically generated linear and parabolic tetrahedral when used to mesh a human femur”. Proc. Inst. Mech. Eng. H. Vol. 215. 2001. pp. 95-94.
How to Cite
Copyright (c) 2018 Revista Facultad de Ingeniería
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Revista Facultad de Ingeniería, Universidad de Antioquia is licensed under the Creative Commons Attribution BY-NC-SA 4.0 license. https://creativecommons.org/licenses/by-nc-sa/4.0/deed.en
You are free to:
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material
Under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
NonCommercial — You may not use the material for commercial purposes.
ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
The material published in the journal can be distributed, copied and exhibited by third parties if the respective credits are given to the journal. No commercial benefit can be obtained and derivative works must be under the same license terms as the original work.