Evaluation of Cement Stresses in Finite Element Analyses of Cemented Orthopaedic Implants

[+] Author and Article Information
A. B. Lennon, P. J. Prendergast

Department of Mechanical Engineering, Trinity College, Dublin 2, Ireland

J Biomech Eng 123(6), 623-628 (Jul 10, 2001) (6 pages) doi:10.1115/1.1412452 History: Received August 24, 2000; Revised July 10, 2001
Copyright © 2001 by ASME
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Comparison of maximum tensile principal stresses in the anterior half of the cement using the scale for the bonded case. The stresses are extrapolated from the integration points and averaged at the nodes. Cases are: (a) bonded, (b) debonded, and (c) debonded with distal cement removed.
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Tensile maximum principal stress vectors in proximal, middle, and distal sections of cement mantle for: (a) bonded, (b) debonded, and (c) debonded with distal cement removed. The proximal and distal sections were taken a small distance away from the layers containing the peak stresses so as to give a more representative illustration of principal stress vectors (this is why the anterior vectors in (a) and distal vectors in (b) do not appear as maxima). P=posterior,M=medial,A=anterior, and L=lateral.
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Distribution of percent volume of cement over a stress range of 0–8 MPa, for the three implanted models
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Percentage volume of cement satisfying probability-of-failure survival at 10 million cycles (PF=1 predicts failure within 10 million cycles and PF=0 predicts survival for the same time period)
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A photograph of the strain gaged femur in the Instron testing machine. Note, there are four gages on each of the anterior, posterior, medial and lateral surfaces (i.e., 12 altogether)
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Finite element meshes of: (a) intact femur, (b) hip prosthesis femoral component, (c) cement mantle, and (d) implanted femur. Note that x axis points medially, y anteriorly, and z superiorly. α is the angle the neck axis makes with its own projection onto the transverse (x–y) plane. β is the angle the neck axis makes with the x axis in the transverse (x–y) plane.
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Strain measured in the femur (strain gauges) versus strain predicted in the femur (finite element). Error bars show ± two standard deviations of each mean gage measurement from three readings.



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