Magnitude and variability of loading on the osseointegrated implant of transfemoral amputees during walking

W C C Lee; Laurent Frossard; K Hagberg; E Haggstrom; D L Gow; Steven Gray; R Brånemark

doi:10.1016/j.medengphy.2007.09.003

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Magnitude and variability of loading on the osseointegrated implant of transfemoral amputees during walking

Journal article

Peer reviewed

Magnitude and variability of loading on the osseointegrated implant of transfemoral amputees during walking

W C C Lee, Laurent Frossard, K Hagberg, E Haggstrom, D L Gow, Steven Gray and R Brånemark

Medical Engineering and Physics, Vol.30(7), pp.825-833

2008

DOI: https://doi.org/10.1016/j.medengphy.2007.09.003

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Abstract

transfemoral amputation

prosthetics

osseointegration

transducer

gait

variability

This study directly measured the load acting on the abutment of the osseointegrated implant system of transfemoral amputees during level walking, and studied the variability of the load within and among amputees. Twelve active transfemoral amputees (age: 54±12 years, mass: 84.3±16.3 kg, height: 17.8±0.10 m) fitted with an osseointegrated implant for over 1 year participated in the study. The load applied on the abutment was measured during unimpeded, level walking in a straight line using a commercial six-channel transducer mounted between the abutment and the prosthetic knee. The pattern and the magnitude of the three-dimensional forces and moments were revealed. Results showed a low step-to-step variability of each subject, but a high subject-to-subject variability in local extrema of body-weight normalized forces and moments and impulse data. The high subject-to-subject variability suggests that the mechanical design of the implant system should be customized for each individual, or that a fit-all design should take into consideration the highest values of load within a broad range of amputees. It also suggests specific loading regime in rehabilitation training are necessary for a given subject. Thus the loading magnitude and variability demonstrated should be useful in designing an osseointegrated implant system better able to resist mechanical failure and in refining the rehabilitation protocol. © 2007 IPEM.

Details

Title: Magnitude and variability of loading on the osseointegrated implant of transfemoral amputees during walking
Authors: W C C Lee (Author) - Queensland University of Technology
Laurent Frossard (Author) - Queensland University of Technology
K Hagberg (Author) - Sahlgrenska University of Hospital, Sweden
E Haggstrom (Author) - Sahlgrenska University of Hospital, Sweden
D L Gow (Author) - Caulfield General Medical Centre
Steven Gray (Author) - Alfred Hospital Melbourne
R Brånemark (Author) - Sahlgrenska University of Hospital, Sweden
Publication details: Medical Engineering and Physics, Vol.30(7), pp.825-833
Publisher: Elsevier Ltd.
Date published: 2008
DOI: 10.1016/j.medengphy.2007.09.003
ISSN: 1350-4533
Organisation Unit: University of the Sunshine Coast, Queensland; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
Language: English
Record Identifier: 99449215802621
Output Type: Journal article

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Web Of Science research areas: Engineering, Biomedical

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