Evaluating the bending response of two osseointegrated transfemoral implant systems using 3D digital image correlation

  1. Get@NRC: Evaluating the bending response of two osseointegrated transfemoral implant systems using 3D digital image correlation (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1115/1.4003871
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Journal titleJournal of Biomechanical Engineering
Article number51006
SubjectAssembly specifications; Bending response; Connection geometry; Critical location; Device failures; Digital image correlations; Loading condition; Material response; Mechanical behavior; Mechanical performance; New design; Osseointegration; Static loading; Strain concentration; Surface strains; Tightening torque; transfemoral amputee; Useful life; Artificial limbs; Image analysis; Loading; Mechanical engineering; Specifications; Strain measurement; Tensile strength; Three dimensional; Tensile strain; algorithm; article; biomechanics; bone prosthesis; bone regeneration; bone strength; compressive strength; controlled study; correlation analysis; digital imaging; equipment design; femur; image analysis; joint function; leg movement; measurement error; osseointegrated transfemoral implant; surface property; tensile strength; three dimensional imaging; torque
AbstractOsseointegrated 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. © 2011 American Society of Mechanical Engineers.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271149
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Record identifier79ec0441-eb78-4005-9aa3-12fdef050a8c
Record created2014-03-24
Record modified2016-05-09
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