The use of a perforated, titanium funicular shell to support the proximal femoral cortex in total hip arthroplasty was evaluated with the aid of both analytical and numerical techniques. The principal interactions between the femoral cortex, the metal shell, the implant stem and the acrylic bone cement were modeled using beam on elastic foundations theory and two-dimensional elasticity theory. Subsequent formulation of this model as a nonlinear design optimization problem enabled the determination of the dimensions of the implant and reinforcing shell which minimized an objective function based on a simplified material failure criterion. Two cases were examined, each with two cervico-diaphyseal angles: case A: with a rigid contact between a proximal prosthesis collar and the calcar femorale and case B: no collar contact (a collarless prosthesis or post-operative loosening). Case A achieved an optimal solution at a stem diameter 11–23 percent of the cortex inner diameter, a stem length to diameter ratio of 12–40, shell diameter 22–53 percent and thickness 0.2–7.2 percent of the cortex inner diameter and thickness, respectively. Case B achieved an optimal solution at a stem diameter 67–92 percent of the cortex inner diameter, length to diameter ratio of 4–6, and no shell. In case A the collar support makes the type of internal fixation unimportant, while in the more realistic case B, the shell is not recommended.
Skip Nav Destination
Article navigation
August 1990
Research Papers
Design Optimization of a Prosthesis Stem Reinforcing Shell in Total Hip Arthroplasty
A. M. de Beus,
A. M. de Beus
Mount Sinai School of Medicine, New York, N.Y. 10029
Search for other works by this author on:
D. A. Hoeltzel,
D. A. Hoeltzel
Department of Mechanical Engineering, Columbia University, New York, N.Y. 10032
Search for other works by this author on:
N. S. Eftekhar
N. S. Eftekhar
Department of Orthopedic Surgery, College of Physicians and Surgeons, Columbia University, New York, N.Y. 10032
Search for other works by this author on:
A. M. de Beus
Mount Sinai School of Medicine, New York, N.Y. 10029
D. A. Hoeltzel
Department of Mechanical Engineering, Columbia University, New York, N.Y. 10032
N. S. Eftekhar
Department of Orthopedic Surgery, College of Physicians and Surgeons, Columbia University, New York, N.Y. 10032
J Biomech Eng. Aug 1990, 112(3): 347-357 (11 pages)
Published Online: August 1, 1990
Article history
Received:
November 9, 1988
Revised:
March 13, 1990
Online:
March 17, 2008
Citation
de Beus, A. M., Hoeltzel, D. A., and Eftekhar, N. S. (August 1, 1990). "Design Optimization of a Prosthesis Stem Reinforcing Shell in Total Hip Arthroplasty." ASME. J Biomech Eng. August 1990; 112(3): 347–357. https://doi.org/10.1115/1.2891195
Download citation file:
Get Email Alerts
Cited By
Related Articles
Design of an Endoreactor for the Cultivation of a Joint-Like-Structure
J. Med. Devices (June,2009)
An Analysis of Crack Propagation Paths at Implant/ Bone-Cement Interfaces
J Biomech Eng (November,1996)
Biomechanical Analysis of Augments in Revision Total Knee Arthroplasty
J Biomech Eng (November,2018)
A Device to Control Implant and Bone-Cement Temperatures in Cemented Arthroplasty
J. Med. Devices (June,2011)
Related Proceedings Papers
Related Chapters
Random Turbulence Excitation in Single-Phase Flow
Flow-Induced Vibration Handbook for Nuclear and Process Equipment
Novel and Efficient Mathematical and Computational Methods for the Analysis and Architecting of Ultralight Cellular Materials and their Macrostructural Responses
Advances in Computers and Information in Engineering Research, Volume 2
Introduction and Definitions
Handbook on Stiffness & Damping in Mechanical Design