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Technical Briefs

Mathematical Reconstruction of Human Femoral Condyles

[+] Author and Article Information
Dawie J. van den Heever

Department of Mechanical and Mechatronic Engineering,  University of Stellenbosch, Stellenbosch 7600, South Africadawie@sun.ac.za

Cornie Scheffer

Department of Mechanical and Mechatronic Engineering,  University of Stellenbosch, Stellenbosch 7600, South Africa

Pieter Erasmus

Knee Clinic Stellenbosch,  University of Stellenbosch, Stellenbosch 7600, South Africa

Edwin Dillon

Department of Orthopaedic Surgery,  University of Stellenbosch, Stellenbosch 7600, South Africa

J Biomech Eng 133(6), 064504 (Jun 22, 2011) (5 pages) doi:10.1115/1.4004314 History: Received November 17, 2010; Revised May 10, 2011; Posted May 30, 2011; Published June 22, 2011; Online June 22, 2011

There is a direct correlation between ligament function and the articulating surface of the normal knee, and changes to any of these structures can affect the other. This is also true for knee replacements, where the articulating surface is greatly changed compared to the natural knee. This study investigated the morphometry of healthy knees and proposes a method to predict original normal knee profiles. A variety of mathematical techniques are compared in terms of the accuracy with which they can represent the original knee joint geometry. Additionally, a method of predicting the irregular femoral condyle geometry for an individual knee is described by making use of the mathematical techniques presented, and the accuracy of this method is also investigated. The mathematical approach using B-splines provides flexibility and can accurately describe the complex geometry of the femoral condyles in both the sagittal and transverse planes. It was further found that the condyles are highly asymmetrical; therefore simpler methods cannot portray the condyles sufficiently and are especially inaccurate in representing the lateral condyle. The study proposes a method for predicting the geometry of the femoral condyles with good accuracy. The B-spline model showed best results.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

Intersection planes through the lateral condyle of a distal femur with the corresponding sagittal and transverse intersection curves

Grahic Jump Location
Figure 2

Fitted models on the medial condyle in the sagittal plane

Grahic Jump Location
Figure 3

Fitted models on the lateral condyle in the transverse plane

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