Prosthetic alignment, patient characteristics, and implant design are all factors in long-term survival of total knee arthroplasty (TKA), yet the level at which each of these factors contribute to implant loosening has not been fully described. Prior clinical and biomechanical studies have indicated tibial overload as a cause of early TKA revision. The purpose of this study was to determine the relationship between tibial component design and bone resection on tibial loading. Finite-element analysis (FEA) was performed after simulated implantation of metal backed (MB) and all-polyethylene (AP) TKA components in 5 and 15 mm of tibial resection into a validated intact tibia model. Proximal tibial strains significantly increased between 13% and 199% when implanted with AP components (p < 0.05). Strain significantly increased between 12% and 209% in the posterior tibial compartment with increased bone resection (p < 0.05). This study indicates elevated strains in AP implanted tibias across the entirety of the proximal tibial cortex, as well as a posterior shift in tibial loading in instances of increased resection depth. These results are consistent with trends observed in prior biomechanical studies and may associate the documented device history of tibial collapse in AP components with increased bone strain and overload beneath the prosthesis.
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April 2016
Research-Article
A Finite-Element Study of Metal Backing and Tibial Resection Depth in a Composite Tibia Following Total Knee Arthroplasty
Susumu Tokunaga,
Susumu Tokunaga
Rose-Hulman Institute of Technology,
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: stokunaga@hotmail.com
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: stokunaga@hotmail.com
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Renee D. Rogge,
Renee D. Rogge
Rose-Hulman Institute of Technology,
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: rogge@rose-hulman.edu
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: rogge@rose-hulman.edu
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Merrill A. Ritter
Merrill A. Ritter
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Susumu Tokunaga
Rose-Hulman Institute of Technology,
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: stokunaga@hotmail.com
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: stokunaga@hotmail.com
Renee D. Rogge
Rose-Hulman Institute of Technology,
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: rogge@rose-hulman.edu
5500 Wabash Avenue,
Terre Haute, IN 47803
e-mail: rogge@rose-hulman.edu
Scott R. Small
Michael E. Berend
Merrill A. Ritter
1Corresponding author.
Manuscript received July 15, 2015; final manuscript received January 1, 2016; published online February 12, 2016. Assoc. Editor: Joel D. Stitzel.
J Biomech Eng. Apr 2016, 138(4): 041001 (8 pages)
Published Online: February 12, 2016
Article history
Received:
July 15, 2015
Revised:
January 1, 2016
Citation
Tokunaga, S., Rogge, R. D., Small, S. R., Berend, M. E., and Ritter, M. A. (February 12, 2016). "A Finite-Element Study of Metal Backing and Tibial Resection Depth in a Composite Tibia Following Total Knee Arthroplasty." ASME. J Biomech Eng. April 2016; 138(4): 041001. https://doi.org/10.1115/1.4032551
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