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• W2034863463 abstract "Analysis of polyethylene component wear and implant loosening in total knee arthroplasty (TKA) requires precise knowledge of in vivo articular motion and loading conditions. This study presents a simultaneous in vivo measurement of tibiofemoral articular contact forces and contact kinematics in three TKA patients. These measurements were accomplished via a dual fluoroscopic imaging system and instrumented tibial implants, during dynamic single leg lunge and chair rising–sitting. The measured forces and contact locations were also used to determine mediolateral distribution of axial contact forces. Contact kinematics data showed a medial pivot during flexion of the knee, for all patients in the study. Average axial forces were higher for lunge compared to chair rising–sitting (224% vs. 187% body weight). In this study, we measured peak anteroposterior and mediolateral forces averaging 13.3% BW during lunge and 18.5% BW during chair rising–sitting. Mediolateral distributions of axial contact force were both patient and activity specific. All patients showed equitable medial–lateral loading during lunge but greater loads at the lateral compartment during chair rising–sitting. The results of this study may enable more accurate reproduction of in vivo loads and articular motion patterns in wear simulators and finite element models. This in turn may help advance our understanding of factors limiting longevity of TKA implants, such as aseptic loosening and polyethylene component wear, and enable improved TKA designs." @default.
• W2034863463 created "2016-06-24" @default.
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• W2034863463 date "2008-07-01" @default.
• W2034863463 modified "2023-10-16" @default.
• W2034863463 title "In vivo contact kinematics and contact forces of the knee after total knee arthroplasty during dynamic weight-bearing activities" @default.
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• W2034863463 doi "https://doi.org/10.1016/j.jbiomech.2008.04.021" @default.
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