Three-Dimensional Finite Element Analysis of Glenoid Replacement Prostheses: A Comparison of Keeled and Pegged Anchorage Systems

[+] Author and Article Information
D. Lacroix, L. A. Murphy, P. J. Prendergast

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

J Biomech Eng 122(4), 430-436 (Mar 22, 2000) (7 pages) doi:10.1115/1.1286318 History: Received June 06, 1999; Revised March 22, 2000
Copyright © 2000 by ASME
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Finite element mesh of the scapula
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Muscle loading on the finite element model of the scapula at 90 deg arm abduction; data from 8
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Schematic representation of the load application on the glenoid surface. The maximum occurs in the superior-anterior quadrant, and the direction of the force is at an angle to the glenoid surface, as shown.
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Exploded views of the insertion of the pegged and keeled prostheses. The cement mantle is shown.
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Magnified deformation plot of the polyethylene pegged components under 90 deg abduction loading shows (a) a view looking directly on the glenoid cavity, (b) the twisting, shearing, and bending orientations; — original position of prostheses; ⋯⋯ deformation of keeled prosthesis; — – deformation of pegged prosthesis
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Cement maximum principal stresses for the normal bone; comparison of designs
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Cement maximum principal stresses for the rheumatoid bone; comparison of designs
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Plots of maximum principal cement stresses for: (a) normal bone and (b) RA bone. View of the anterior side.
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(a) von Mises stresses of the normal bone: (i) the keeled prosthesis, (ii) the pegged prosthesis; (b) von Mises stresses of the rheumatoid bone: (i) the keeled prosthesis, (ii) the pegged prosthesis; A1, A2, B1, and B2 are regions of high stress
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Comparison of the regions of high stress, taking account of the reduction of density in bone due to RA. Each bar represents one point at the bone/cement interface. Stress is plotted as ratio of maximum principal stress-to-strength.




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