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Metaphyseal Stem Extension Improves Tibial Stability in Cementless Total Knee Arthroplasty.
Morwood, Michael P; Guss, Andrew D; Law, Jesua I; Pelt, Christopher E.
Afiliação
  • Morwood MP; Hofmann Arthritis Institute, Salt Lake City, UT.
  • Guss AD; University of Utah Department of Orthopaedics, Orthopaedic Bioengineering Research Laboratory, Salt Lake City, UT.
  • Law JI; Hofmann Arthritis Institute, Salt Lake City, UT.
  • Pelt CE; Department of Orthopaedics, University of Utah, Salt Lake City, UT.
J Arthroplasty ; 35(10): 3031-3037, 2020 10.
Article em En | MEDLINE | ID: mdl-32600812
BACKGROUND: The goal was to determine if the addition of a metaphyseal stem extension limits micromotion of a cementless tibial component during cyclic loading in primary total knee arthroplasty. The hypothesis tested was that the use of a 50-mm stem extension on a cementless tibial component would limit motion compared with an identical cementless component without a stem extension. METHODS: The study used 3 variations of a tibial component from the same total knee arthroplasty system. Group 1 consisted of a cementless tibial component without a stem extension. Group 2 used the same cementless component as group 1, but with the addition of a short 50-mm stem. Group 3 consisted of a cemented tibial component without a stem extension to serve as a "control" (gold standard). The tibial specimens were implanted into a synthetic bone model and tested using a physiological medial-lateral 60/40 load distribution for 5000 cycles. RESULTS: The results demonstrated a significant decrease in motion at the anterior region of the cementless stem extension (group 2) components compared with the cementless with no stem extension (group 1). The cementless with stem extension (group 2) demonstrated similar results at all cycles to the cemented (group 3) components at the anterior region. CONCLUSION: The addition of a short metaphyseal stem (50mm) to a keel plus 4-peg tibial component design provides a significant reduction in micromotion during cyclic loading of a cementless tibial baseplate in a synthetic foam bone model, similar to a cemented implant.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Artroplastia do Joelho / Prótese do Joelho Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Artroplastia do Joelho / Prótese do Joelho Idioma: En Ano de publicação: 2020 Tipo de documento: Article