Risk of failure during gait for direct skeletal attachment of a femoral prosthesis : a finite element study

Helgason, Benedikt, Palssona, Halldor, Runarssona, Tomas Philip, Frossard, Laurent A., & Viceconti, Marco (2009) Risk of failure during gait for direct skeletal attachment of a femoral prosthesis : a finite element study. Medical Engineering and Physics, 31(5), pp. 595-600.

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Direct skeletal attachments for transfemoral amputees have been the subject of clinical trials since the early nineties. This method of attachment allows the amputee an unrestricted range of motion around the hip joint, better sitting comfort, improved sensory feedback through osseoperception, improved limb control and reduced soft tissue problems. However, the length of the rehabilitation period is perceived as a shortcoming by the amputees and the clinicians. The aim of the present study is to estimate the risk of failure during gait, for a patient with direct skeletal attachment of a femoral prosthesis, using finite element analysis (FEA). Material properties and loads were derived from subject-specific data and implant stability assumed secured by bone ingrowth into a porous implant surface. A simplified FEA was used to optimize the implant geometry with respect to load bearing capacity. The resulting geometry was then implemented in a subject-specific FE study. The results indicate that the risk of failure for the implant system is approximately three times greater than what can be expected for an intact femur. The main conclusion, based on the risk of failure factors calculated, is that it is likely that a porous-coated implant could be beneficial for osseointegrated fixation. It is also suggested that the proposed methodology can be used in future studies exploring the mechanical stability of osseointegrated fixation in the view of improving direct skeletal attachments for lower limb amputees.

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14 citations in Web of Science®

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ID Code: 20850
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Finite element analysis, Femur, Direct skeletal attachment, Optimization, Orthopedic implants
DOI: 10.1016/j.medengphy.2008.11.015
ISSN: 1350-4533
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2009 Elsevier
Deposited On: 27 May 2009 22:38
Last Modified: 10 Aug 2011 18:05

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