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A Parametric Study on the Geometrical Design of Augmented Cones for Revision Total Knee Arthroplasty
, Article 2024 31st National and 9th International Iranian Conference on Biomedical Engineering, ICBME 2024 ; 2024 , Pages 372-379 ; 979-833152971-0 (ISBN) ; Naserkhaki, S ; Farahmand, F ; Sharif University of Technology
2024
Abstract
The purpose of this research was to address the design of augmented cones used in revision knee arthroplasty surgeries to fill the large bone defects in metaphyseal regions. A parametric finite element study was performed to investigate the effect of the geometrical design variables of the cone on its biomechanical performance. The model included a nonhomogeneous voxel-based representation for bone, a parametric model of the cone, a standard femoral component of the revision knee arthroplasty, and a cement layer between the cone and implant. Sixteen designs of the cone were analyzed by changing its upper and lower radii, which resulted in different cone angles and cone thicknesses. The...
Finitely generated subnormal subgroups of GLn(D) are central
, Article Journal of Algebra ; Volume 225, Issue 2 , 2000 , Pages 517-521 ; 00218693 (ISSN) ; Mahmudi, M. G ; Yasamin, S ; Sharif University of Technology
Academic Press Inc
2000
Abstract
Let D be an infinite division algebra of finite dimension over its center. Assume that N is a subnormal subgroup of GLn(D) with n≥1. It is shown that if N is finitely generated, then N is central. © 2000 Academic Press
Numerical and Experimental Investigation of the Effect of Cement Mantle Thickness between the Stem and the Femoral Cone in Revision Total Knee Arthroplasty
, M.Sc. Thesis Sharif University of Technology ; Farahmand, Farzam (Supervisor) ; Naserkhaki, Sadegh (Co-Supervisor)
Abstract
Revision total knee arthroplasty (rTKA) is recognized as one of the most challenging orthopedic surgeries due to extensive bone loss and compromised stability of the primary implant. The use of porous metaphyseal cones as substitutes for lost bone segments has emerged as an effective strategy to enhance implant stability. However, the optimal design of these cones—particularly the maximum allowable thickness of the cement mantle between the cone and the implant stem—has a direct impact on the biomechanical performance and long-term stability of the implant. Excessive cement thickness can lead to high shrinkage during polymerization, reduced implant-cement interface integrity, and increased...