Osseointegrated transfemoral implants have been introduced as a prosthetic solution for above knee amputees. They have shown great promise, providing an alternative for individuals who could not be accommodated by conventional, socket-based prostheses; however, the occurrence of device failures is of concern. In an effort to improve the strength and longevity of the device, a new design has been proposed. This study investigates the mechanical behavior of the new taper-based assembly in comparison to the current hex-based connection for osseointegrated transfemoral implant systems. This was done to better understand the behavior of components under loading, in order to optimize the assembly specifications and improve the useful life of the system. Digital image correlation was used to measure surface strains on two assemblies during static loading in bending. This provided a means to measure deformation over the entire sample and identify critical locations as the assembly was subjected to a series of loading conditions. It provided a means to determine the effects of tightening specifications and connection geometry on the material response and mechanical behavior of the assemblies. Both osseoinegrated assemblies exhibited improved strength and mechanical performance when tightened to a level beyond the current specified tightening torque of 12 N m. This was shown by decreased strain concentration values and improved distribution of tensile strain. Increased tightening torque provides an improved connection between components regardless of design, leading to increased torque retention, decreased peak tensile strain values, and a more gradual, primarily compressive distribution of strains throughout the assembly.
Skip Nav Destination
Article navigation
Research Papers
Evaluating the Bending Response of Two Osseointegrated Transfemoral Implant Systems Using 3D Digital Image Correlation
Melanie L. Thompson,
Melanie L. Thompson
Department of Mechanical and Materials Engineering,
Queen’s University
, McLaughlin Hall, Kingston, ON, K7L 3N6, Canada
Search for other works by this author on:
David Backman,
David Backman
Institute for Aerospace Research,
National Research Council Canada
, 1200 Montreal Road, Building M-14, Ottawa, ON, K1A 0R6, Canada
Search for other works by this author on:
Rickard Branemark,
Rickard Branemark
Centre of Orthopaedic Osseointegration Sahlgrenska
University Hospital, Per Dubbsgatan 15
, 413 45 Gothenburg, Sweden
Search for other works by this author on:
Chris K. Mechefske
Chris K. Mechefske
Department of Mechanical and Materials Engineering,
Queen’s University
, McLaughlin Hall, Kingston, ON, K7L 3N6, Canada
Search for other works by this author on:
Melanie L. Thompson
Department of Mechanical and Materials Engineering,
Queen’s University
, McLaughlin Hall, Kingston, ON, K7L 3N6, Canada
David Backman
Institute for Aerospace Research,
National Research Council Canada
, 1200 Montreal Road, Building M-14, Ottawa, ON, K1A 0R6, Canada
Rickard Branemark
Centre of Orthopaedic Osseointegration Sahlgrenska
University Hospital, Per Dubbsgatan 15
, 413 45 Gothenburg, Sweden
Chris K. Mechefske
Department of Mechanical and Materials Engineering,
Queen’s University
, McLaughlin Hall, Kingston, ON, K7L 3N6, CanadaJ Biomech Eng. May 2011, 133(5): 051006 (9 pages)
Published Online: April 28, 2011
Article history
Received:
July 23, 2010
Revised:
March 11, 2011
Posted:
March 28, 2011
Published:
April 28, 2011
Online:
April 28, 2011
Citation
Thompson, M. L., Backman, D., Branemark, R., and Mechefske, C. K. (April 28, 2011). "Evaluating the Bending Response of Two Osseointegrated Transfemoral Implant Systems Using 3D Digital Image Correlation." ASME. J Biomech Eng. May 2011; 133(5): 051006. https://doi.org/10.1115/1.4003871
Download citation file:
Get Email Alerts
Cited By
Related Articles
Laboratory Evaluation of Total Knee Replacements (TKRs) to Restore Normal Function
J. Med. Devices (June,2010)
Design of an Endoreactor for the Cultivation of a Joint-Like-Structure
J. Med. Devices (June,2009)
A Design Framework of Unloaded Leaflet Shape for the Ovine Pulmonary Valve Single Leaflet Replacement Surgery
J. Med. Devices (June,2011)
PMMA Implants Increase Femoral Strength
J. Med. Devices (June,2008)
Related Proceedings Papers
Related Chapters
Introduction and Definitions
Handbook on Stiffness & Damping in Mechanical Design
Understanding the Problem
Design and Application of the Worm Gear
Data Tabulations
Structural Shear Joints: Analyses, Properties and Design for Repeat Loading