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Changes in femur stress after hip resurfacing arthroplasty: Response to physiological loads

Little, J. Paige, Taddei, Fulvia, Viceconti, Marco , Murray, David W., & Gill, Harinderjit S. (2007) Changes in femur stress after hip resurfacing arthroplasty: Response to physiological loads. Clinical Biomechanics, 22(4), pp. 440-448.

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Abstract

Background Hip resurfacing arthroplasty is being increasingly considered as an alternative to total hip arthroplasty in young, active patients. Hip resurfacing arthroplasty is reported to preserve the normal joint mechanics. However, there is concern, in the short term, due to frequent occurrence of femoral neck fractures. Methods We evaluated changes in femoral mechanics after hip resurfacing arthroplasty. We used an experimentally validated, distributed material finite element model of a cadaveric femur before and after hip resurfacing arthroplasty. Bone stiffness and strength values representing normal, elderly and osteoporotic bone were used. For a physiological load case, bone strains were compared with literature values for total hip arthroplasty and a risk of fracture scalar calculated. Findings The changes in peak stresses after hip resurfacing arthroplasty were low in relation to the failure strength of bone and the fracture risk was low. The intact and implanted finite element models showed bone strains after hip resurfacing arthroplasty were closer to the intact condition than after total hip arthroplasty. Interpretation The bone stresses predicted after resurfacing in both the normal and aged femoral neck were not sufficient to be a potential cause of fracture.

Impact and interest:

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44 citations in Web of Science®

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ID Code: 7452
Item Type: Journal Article
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: j2.little@qut.edu.au
Keywords: resurfacing, hip, finite element, mechanics
DOI: 10.1016/j.clinbiomech.2006.12.003
ISSN: 0268-0033
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomedical Instrumentation (090303)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2007 Elsevier
Deposited On: 09 May 2007
Last Modified: 01 Mar 2012 00:30

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