Properties of the tibial component regarding impact load

Load transmission through knee prostheses was examined to clarify how the tibial component behaves under dynamic loading conditions. We did Genesis II total knee arthroplasty using sawbones and measured impact load transmission ratios using the split-Hopkinson pressure bar technique. We also measure...

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Bibliographic Details
Published inClinical orthopaedics and related research no. 423; p. 172
Main Authors Yoshino, Kazunori, Koga, Yoshio, Segawa, Hiroyuki, Ueno, Yuichi, Tanabe, Yuji, Endo, Naoto, Omori, Go
Format Journal Article
LanguageEnglish
Published United States 01.06.2004
Subjects
Arthroplasty, Replacement, Knee - instrumentation
Biomechanical Phenomena
Humans
Knee Joint - physiology
Knee Prosthesis
Materials Testing
Polyethylene
Prosthesis Design
Tibia - physiology
Weight-Bearing - physiology
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Summary:Load transmission through knee prostheses was examined to clarify how the tibial component behaves under dynamic loading conditions. We did Genesis II total knee arthroplasty using sawbones and measured impact load transmission ratios using the split-Hopkinson pressure bar technique. We also measured the polyethylene strain when an impact load was applied using a strain gauge bonded to the anterior surface of the polyethylene. The impact load transmission ratios of metal-backed and all-polyethylene tibial components were less than 4%. Greater load transmission was observed with metal-backed components, which suggests that some of the applied dynamic load is transferred directly to the tibial cortical bone. Increasing polyethylene thickness decreased impact load transmission ratios in both components, which might lower the cancellous bone stresses beneath tibial implants. Greater strain in the tibial component was observed in all-polyethylene components. Increased polyethylene thickness did not significantly decrease the polyethylene strain, probably because of the nonlinear elastic behavior of the polyethylene material. The distant positioning of the strain gauge may, however, have prevented the detection of local contact strains. Recent clinical studies did not confirm our theoretical predictions, suggesting that other factors contribute more significantly to the clinical outcome in current total knee arthroplasty.
ISSN:0009-921X
DOI:10.1097/01.blo.0000129158.19228.2b