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

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 pl...

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Bibliographic Details
Published in:Archives of orthopaedic and trauma surgery 2006-01, Vol.126 (1), p.45-48
Main Authors: Luring, C, Perlick, L, Trepte, C, Linhardt, O, Perlick, C, Plitz, W, Grifka, J
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Knee - instrumentation
Arthroplasty, Replacement, Knee - methods
Bone Cements
Cementation - instrumentation
Cementation - methods
Equipment Failure Analysis
Humans
In Vitro Techniques
Internal Fixators
Joint replacement surgery
Joint surgery
Prosthesis Design
Prosthesis Failure
Tibia - surgery
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Summary: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). 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. 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
ISSN:0936-8051
1434-3916
DOI:10.1007/s00402-005-0082-5