Sagittal Profile of the Femoral Condyles and Its Application to Femorotibial Contact Analysis

[+] Author and Article Information
N. Nuño, A. M. Ahmed

Department of Mechanical Engineering, McGill University, Montréal, Québec, Canada H3A 2K6

J Biomech Eng 123(1), 18-26 (Oct 16, 2000) (9 pages) doi:10.1115/1.1339819 History: Received November 05, 1998; Revised October 16, 2000
Copyright © 2001 by ASME
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Grahic Jump Location
Description of the coordinate system. (a) Frontal and lateral views of the femoral bone-stub axis; (b) complete femoral anatomic coordinate system; (c) positioning and alignment of the specimen inside a box with edges parallel to the femoral anatomic coordinate system
Grahic Jump Location
Two-circular-arc model describing the femoral condyles in the sagittal plane. The dots represent the experimentally digitized points of the medial condyle of one male left-knee specimen; r1=19.9 mm,r2=35.0 mm,σ=0.18 mm
Grahic Jump Location
Typical two-dimensional representation of the raw data of one male right-knee digitized specimen at 90 deg flexion angle showing the sagittal plane located at the lowest point
Grahic Jump Location
Effect of the variation of the sagittal plane located at the x coordinate of the lowest point in the y axis. The two-circular-arc models for the lateral condyle of a female right-knee specimen are: for x=19.5 mm,r1=15.6 mm,r2=30.4 mm,(r1/r2=0.513); for x=20.5 mm,r1=15.8 mm,r2=27.0 mm,(r1/r2=0.585); for x=22.5 mm,r1=14.0 mm,r2=25.1 mm(r1/r2=0.558)
Grahic Jump Location
(a) Schematic representation of the condylar femorotibial contact of one implant; sagittal profile (b) and frontal profile (c) of the femorotibial surfaces in contact showing the variables used in the Rigid-Body-Spring Model for the nonlinear contact analysis
Grahic Jump Location
Two-circular-arc model for the medial condyle of a male left-knee specimen (different from the one considered in Fig. 2) for two different femoral coordinate systems: z axis aligned with the mechanical (r1/r2=0.557) and anatomical (r1/r2=0.553) axes
Grahic Jump Location
One-circular-arc model for the medial condyle of a male left-knee specimen (the same condyle as the one considered in Fig. 6) for two different femoral coordinate systems: z axis aligned with the mechanical (r=23.7 mm) and anatomical (r=24.0 mm) axes
Grahic Jump Location
Results of the parametric contact analysis for 45 deg flexion angle showing the effect of varying the femorotibial conformity rt/r2 in the sagittal plane and of increasing radius r1 on the peak contact stresses for a radius of curvature of the femoral and tibial components of 21 mm in the frontal plane, r2=35.8 mm
Grahic Jump Location
Results of the parametric contact analysis for 45 deg flexion angle showing the effect of changing the sagittal profile geometry and the radius of curvature of the femoral and tibial components in the frontal plane for a femorotibial conformity rt/r2=1 in the sagittal plane, r2=35.8 mm




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