Abstract
In spite of improvements in cementing technique, migration of tibial component remains a problem in total knee arthroplasty. This study compares the primary stability of tibial components using two different cementing techniques with roentgen stereophotogrammetric analysis (RSA) in vitro. A total of 20 tibia specimens were matched into two groups, 10 specimens per group. Cementing technique was randomized to each group. In the first group only the base and in the second group the base and stem were cemented. The implants and the tibial metaphysis were marked with markers for the RSA analysis. All specimens were tested with an axial load of 2,000 N for 1,000 and 10,000 cycles and RSA analysis was performed. Endpoints for radiosterometric analysis were maximum total point motion, maximum subsidence, lift off, rotation and translation along the x-, y-, and z-axes. After 1,000 and 10,000 cycles, no significant differences could be found, but two tibial components of the surface cementing group showed a migration of more than 2 mm defined as failure compared to six failed tibial components in the full cementing group (P = 0.068). This higher number of failed arthroplasties in the fully cemented prosthesis group demonstrates a disadvantageous load distribution in the tibia apophysis which can cause an early component loosening.
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Acknowledgments
The authors wish to thank the Anatomical Institute of the University of Duesseldorf for donating the tibia specimens. Furthermore we thank Smith & Nephew, Inc. and Heraeus Inc. for donating the required tibial components and bone cement.
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The authors declare that they have no conflict of interest.
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Skwara, A., Figiel, J., Knott, T. et al. Primary stability of tibial components in TKA: in vitro comparison of two cementing techniques. Knee Surg Sports Traumatol Arthrosc 17, 1199–1205 (2009). https://doi.org/10.1007/s00167-009-0849-2
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DOI: https://doi.org/10.1007/s00167-009-0849-2