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TECHNICAL PAPERS

The Effect of Vastus Medialis Forces on Patello-femoral Contact: A Model-based Study

[+] Author and Article Information
Yasin Y. Dhaher

Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL; Department of Physical Medicine and Rehabilitation, Department of Biomedical Engineering, Northwestern University, Evanston, IL

Leonard E. Kahn

Department of Biomedical Engineering, Northwestern University, Evanston, IL; Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL

J Biomech Eng 124(6), 758-767 (Dec 27, 2002) (10 pages) doi:10.1115/1.1516196 History: Received December 01, 2000; Revised June 01, 2002; Online December 27, 2002
Copyright © 2002 by ASME
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References

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Figures

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Graphical representation of the bone surface models and their corresponding coordinate systems for the tibia, femur, and patella. Also shown are the three bundles used to represent the patellar tendons and the five quadriceps force vectors.
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Definition of patellar kinematics (left). The bone surface models with the normal vectors at the contact points (right). R⃗c1,2f and r⃗c1,2p represent the lateral (1) and medial (2) contact locations on the femur and patella respectively in their own coordinate systems while N⃗c1,2f and n⃗c1,2p are the corresponding contact force vectors.
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Patellar tilt and mediolateral shift in the model using a single contact point on each condyle (-), multiple contact points (⋅-), and cadaver data reported by Goh et al. (o). The simulations and cadaver experiments were performed with each of the quadriceps loaded proportional to its PCSA. The reported patellar shift values are with respect to location at 30° knee flexion.
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Comparison of peak contact force computation during single (-) and multi-point (⋅ -) contact formulation
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Medial and lateral contact force ratios as tuning parameters γ4 and γ5 are varied between 0 and 1 together. The ratio is formed by normalizing to the condition where γ45=0.
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Medial and lateral contact force ratios as the VML tuning parameter, γ5=1 and VMO, γ4 is varied between 0 and 1. The forces were normalized to the condition where γ45=0.
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Medial and lateral contact force ratios as the VML tuning parameter, γ5=0 and VMO, γ4 is varied between 0 and 1. The forces were normalized to the condition where γ45=0.
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Medial and lateral contact force ratios as the VMO tuning parameter, γ4=1 and VML, γ5 is varied between 0 and 1. The forces were normalized to the condition where γ45=0.
Grahic Jump Location
Medial and lateral contact force ratios as the VMO tuning parameter, γ4=0 and VML, γ5 is varied between 0 and 1. The forces were normalized to the condition where γ45=0.

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