Design, calibration and pre-clinical testing of an instrumented tibial tray

Heinlein, Bernd; Graichen, F.; Bender, Alwina; Rohlmann, A.; Bergmann, G.

doi:10.1016/j.jbiomech.2007.02.014

Cited by 124 publications

(88 citation statements)

References 23 publications

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“…16 The design was based on the Innex FIXUC total knee system (Zimmer GmbH, Winterthur, Switzerland), which is a cruciate-sacrificing implant with a fixed ultracongruent tibial insert. The tibial component was modified using a stem-in-stem design.…”

Section: Instrumented Implantmentioning

confidence: 99%

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Kutzner

Heinlein²,

Graichen³

et al. 2012

J Orthop Sports Phys Ther

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Section: Instrumented Implantmentioning

confidence: 99%

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Kutzner

Heinlein²,

Graichen³

et al. 2012

J Orthop Sports Phys Ther

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“…Motion analysis was performed on two male TKR patients (64 and 78 years; 19 and 8 months post-op; weights 100 and 92 kg, respectively); both received telemetric knee implants based on a commercial design (INNEX, Zimmer GmbH, Winterthur, Switzerland) 28 to record the in vivo TF forces during walking, stair climbing, sit-to-stand, and squatting. Both patients provided written informed consent, and the study was approved by the local ethics committee.…”

Section: Subjectsmentioning

confidence: 99%

Patellofemoral joint contact forces during activities with high knee flexion

Trepczynski

Kutzner

Kornaropoulos

et al. 2011

Journal Orthopaedic Research

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The patellofemoral (PF) joint plays an essential role in knee function, but little is known about the in vivo loading conditions at the joint. We hypothesized that the forces at the PF joint exceed the tibiofemoral (TF) forces during activities with high knee flexion. Motion analysis was performed in two patients with telemetric knee implants during walking, stair climbing, sit-to-stand, and squat. TF and PF forces were calculated using a musculoskeletal model, which was validated against the simultaneously measured in vivo TF forces, with mean errors of 10% and 21% for the two subjects. The in vivo peak TF forces of 2.9-3.4 bodyweight (BW) varied little across activities, while the peak PF forces showed significant variability, ranging from less than 1 BW during walking to more than 3 BW during high flexion activities, exceeding the TF forces. Together with previous in vivo measurements at the hip and knee, the PF forces determined here provide evidence that peak forces across these joints reach values of around 3 BW during high flexion activities, also suggesting that the in vivo loading conditions at the knee can only be fully understood if the forces at the TF and the PF joints are considered together. ß

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“…1) allows the measurement of three contact forces and three moments in vivo. 28 It is based on the INNEX FIXUC total knee system (Zimmer GmbH, Winterthur, Switzerland) with a standard femoral component and a standard ultra-congruent tibial insert. The tibial component is modified to enable a slight deformation of the stem which is measured by six semi-conductor strain gages (KSP 1-350-E4, Kyowa, Japan).…”

Section: Instrumented Implantmentioning

confidence: 99%

The effect of laterally wedged shoes on the loading of the medial knee compartment‐in vivo measurements with instrumented knee implants

Kutzner

Damm

Heinlein

et al. 2011

Journal Orthopaedic Research

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A conventional method to unload the medial compartment of patients with gonarthrosis and thus to achieve pain reduction is the use of laterally wedged shoes. Our aim was to measure in vivo their effect on medial compartment loads using instrumented knee implants. Medial tibio-femoral contact forces were measured in six subjects with instrumented knee implants during walking with the following shoes: without wedge, with 5 and 10 mm wedges under the lateral sole, and with a laterally wedged insole (5 mm). Measurements were repeated with the shoes in combination with an ankle-stabilizing orthosis. Without orthosis, peak medial forces were reduced by only 1-4% on average. With orthosis, the average reduction was 2-7%. Highest reductions were generally observed with the 10 mm wedge, followed by the 5 mm wedge, and the 5 mm insole. Individual force reductions reached up to 15%. Medial force reductions while walking with wedged shoes were generally small. Due to high inter-individual differences, it seems that some patients might benefit from lateral wedges, whereas others might not. Further analyses of the individual kinematics will show which factors are most decisive for the reduction of medial compartment load. ß

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Design, calibration and pre-clinical testing of an instrumented tibial tray

Cited by 124 publications

References 23 publications

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Patellofemoral joint contact forces during activities with high knee flexion

The effect of laterally wedged shoes on the loading of the medial knee compartment‐in vivo measurements with instrumented knee implants

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