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Micromotion in cemented rotating platform total knee arthroplasty: cemented tibial stem versus hybrid fixation

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Abstract

Introduction: Improving the longevity and reliability of cemented total knee arthroplasty (TKA) remains a major step to achieve. It is still unclear, whether a cemented tibial stem reduces micromotion of the tibial tray and produces therefore a better initial stability or not. The higher conformity of rotating platform design and the possible rotary forces to the tibial platform may produce higher micromotion when the tibial stem remains cementless (hybrid fixation). Materials and methods: An in vitro study was performed using the PFC® mobile bearing tibial tray (DePuy®, Warswa, IN, USA) to test the hypothesis that the addition of cement surrounding the tibial stem reduces micromotion of the tibial tray in cemented TKA with mobile bearing design. Ten tibial trays with mobile design were implanted in sawbones with a 3-mm cement mantle beneath the baseplate of the tibial tray and with or without the cemented stem. Tibial trays were loaded additionally in the ventral, lateral, medial and posterior positions with 2,500 N using the Zwick Z010® instrumentation and HBM pick up Hottinger Baldwin®. Results: In this study, a significant increased mean maximum liftoff was found when only cementing the tibial baseplate (hybrid fixation), compared to the fully cemented tibial tray (P<0.02). Conclusion: In conclusion, the stem of mobile bearing tibial components should be cemented to provide increased micromotion and earlier loosening.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, University of Regensburg, Kaiser-Karl-V. Allee 3, 93077, Bad Abbach, Germany

    C. Luring, L. Perlick, C. Trepte, O. Linhardt & J. Grifka

  2. Department of Orthopaedics, Amtssygehus, Aalborg Sygehus, Aarhus Universitetshospital Hobrovej, Aalborg, Denmark

    C. Perlick

  3. Laboratory for Biomechanics and Experimental Orthopaedics, Ludwigs-Maximilians-University, Munich, Germany

    W. Plitz

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  1. C. Luring
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  2. L. Perlick
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  3. C. Trepte
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  4. O. Linhardt
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  5. C. Perlick
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  6. W. Plitz
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  7. J. Grifka
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Correspondence to C. Luring.

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Luring, C., Perlick, L., Trepte, C. et al. Micromotion in cemented rotating platform total knee arthroplasty: cemented tibial stem versus hybrid fixation. Arch Orthop Trauma Surg 126, 45–48 (2006). https://doi.org/10.1007/s00402-005-0082-5

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  • DOI: https://doi.org/10.1007/s00402-005-0082-5

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